Given the equilibrium constants for the equilibria, Kc for the following
equilibrium is 3.06 × 10⁴
What is equilibrium constant ?A chemical reaction's equilibrium constant is the value of its reaction quotient at chemical equilibrium, a state attained by a dynamic chemical system after a sufficient amount of time has passed in which its composition has no measurable tendency to change further. The equilibrium constant is independent of the initial analytical concentrations of the reactant and product species in the mixture for a given set of reaction conditions. As a result, given the initial composition of a system, known equilibrium constant values can be used to determine the system's composition at equilibrium. Temperature, solvent, and ionic strength, for example, can all influence the value of the equilibrium constant.
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What volume (mL) of 0.250 M HNO3 is required to titrate (neutralize) a solution containing 0.297 g of KOH?
21.16 mL of 0.250 M HNO3 is required to titrate (neutralize) a solution containing 0.297 g of KOH.
StepsTo solve this problem, we need to use the balanced chemical equation for the reaction between HNO3 and KOH, which is:
HNO3 + KOH → KNO3 + H2O
From the equation, we can see that one mole of HNO3 reacts with one mole of KOH.
First, we need to determine the number of moles of KOH in 0.297 g of KOH:
mass of KOH = 0.297 g
molar mass of KOH = 56.11 g/mol
number of moles of KOH = mass/molar mass = 0.297 g/56.11 g/mol = 0.00529 mol
Since one mole of HNO3 reacts with one mole of KOH, we need 0.00529 moles of HNO3 to neutralize the KOH.
Now, we can use the molarity and the number of moles of HNO3 to calculate the required volume of HNO3:
Molarity of HNO3 = 0.250 M
Number of moles of HNO3 = 0.00529 mol
Volume of HNO3 = Number of moles of HNO3/Molarity of HNO3
Volume of HNO3 = 0.00529 mol/0.250 mol/L
The volume of HNO3 = 0.02116 L or 21.16 mL
Therefore, 21.16 mL of 0.250 M HNO3 is required to titrate (neutralize) a solution containing 0.297 g of KOH.
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a scientific theory is
answer: a well-tested explanation for a widely accepted hypothesis
A scientific theory is a well-tested explanation for a widely accepted hypothesis.
What is a scientific theory?A scientific theory is a coherent statement or set of ideas that explains observed facts or phenomena and correctly predicts new facts or phenomena not previously observed, or which sets out the laws and principles of something known or observed.
In summary, a theory is a hypothesis confirmed by observation or experiment.
A body of facts that have been repeatedly confirmed through observation and experiment is said to be a theory.
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molarity of a solution that contains 29.4 grams of NaCl in 250 ml of water?
Answer:
2.16 M
Explanation:
The molarity of the solution is 2.16 M. To calculate the molarity, you need to first determine the number of moles: 29.4 grams of NaCl is equal to 0.737 moles. Then, divide the number of moles, 0.737, by the volume of the solution, which is 250 mL. Multiplying the result by 1000 gives the molarity, which is 2.16 M.
yw
A chemist must dilute 93.1 mL of 7.79 of uM aqueous mercury (I) chloride solution until the concentration falls to 3.00 uM. She’ll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate the final volume in liters.
Taking into account the definition of dilution, if chemist must dilute 93.1 mL of 7.79 of uM aqueous mercury (I) chloride solution until the concentration falls to 3.00 uM, the final volume is 0.24175 L.
Definition of dilutionDilution is a procedure by which the concentration of a solution is lowered, usually with the addition of a diluent.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeFinal volumeIn this case, you know:
Ci= 7.79 uMVi= 93.1 mLCf= 3 uMVf= ?Replacing in the definition of dilution:
7.79 uM× 93.1 mL= 3 uM× Vf
Solving:
(7.79 uM× 93.1 mL)÷ 3 uM= Vf
241.75 mL= 0.24175 L = Vf (being 1000 mL= 1 L)
In summary, the final volume is 0.24175 L.
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is CF3Cl a polar or non-polar molecule?
Answer: Polar
Explanation: This is because if you look up the Lewis Dot structure of this specific molecule, it will have some net dipole moment, which makes it polar.
It can be considered that when a molecule does have some net dipole moment, it is polar.
So, yes CF3Cl is polar.
CF₃Cl, also known as chlorotrifluoromethane, is a polar molecule.
To determine the polarity of a molecule, consider the individual bond polarities and the molecular geometry.
In CF₃Cl, there is a difference in electronegativity between carbon (C) and chlorine (Cl), as well as between carbon and fluorine (F). Chlorine and fluorine are more electronegative than carbon, meaning they have a greater ability to attract electrons toward themselves.
The C-Cl bond and the C-F bonds in CF₃Cl are polar bonds due to the electronegativity difference. The Cl and F atoms pull the shared electrons towards themselves, creating partial negative charges on those atoms and partial positive charges on the carbon atom.
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Which of the following groups of substances involve the use of chemicals? Indicate all that apply
All of the groups of substances involve the use of chemicals from the question that we have here.
What are chemicals?Chemicals are essential to life and to many industries, including agriculture, medicine, manufacturing, and technology. They can be found in everyday objects such as food, clothing, electronics, and cleaning products.
Chemicals can be classified into various categories based on their properties, chemical structure, and uses. Some common categories of chemicals include:
Elements: Pure substances that cannot be broken down into simpler substances. Examples include carbon, oxygen, and gold.
Compounds: Substances composed of two or more elements chemically bonded together. Examples include water (H2O) and table salt (NaCl).
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Which of the following groups of substances involve the use of chemicals? Indicate all that apply.
Check all that apply.
Which of the following groups of substances involve the use of chemicals? Indicate all that apply.Check all that apply.
A light-weight bicycle frame, food packaging, a car exhaust catalytic converter
Soap, shampoo, washing powder
Antiseptic cream, pain killers, energy drinks
Paints, printer toner, food coloring
Computer displays, LED lights, barcode readers
Use the following equations to find the lattice energy of MgCl₂? (hint: first write the equation for
the lattice energy of MgCl2(s))
Mg(g) → Mg2+(g) + 2 e
CI(g) + eCl (g)
Mg(g) + 2Cl(g) → MgCl₂(s)
+2188 kJ/mol
-337 kJ/mol
AH = -642 kJ/mol
Answer:
Explanation:
The lattice energy (LE) of MgCl₂ can be calculated using the Born-Haber cycle, which relates the lattice energy to other thermodynamic quantities such as enthalpy of sublimation, ionization energy, electron affinity, and heat of formation.
The equation for the lattice energy of MgCl₂ is:
LE(MgCl₂) = H(sublimation of Mg) + IE(Mg) + EA(Cl) + 1/2 H₂(Cl₂) - DH(f)(MgCl₂)
where H(sublimation of Mg) is the enthalpy of sublimation of Mg, IE(Mg) is the ionization energy of Mg, EA(Cl) is the electron affinity of Cl, H₂(Cl₂) is the heat of formation of Cl₂, and DH(f)(MgCl₂) is the heat of formation of MgCl₂.
We are given the following equations:
Mg(g) → Mg2+(g) + 2 e ΔH₁ = +2188 kJ/mol
Cl(g) + e → Cl-(g) ΔH₂ = -337 kJ/mol
Mg(s) + Cl₂(g) → MgCl₂(s) ΔH₃ = -642 kJ/mol
Using these equations, we can calculate the values of H(sublimation of Mg), IE(Mg), EA(Cl), H₂(Cl₂), and DH(f)(MgCl₂) as follows:
H(sublimation of Mg) = ΔH₂(Mg(g)) + 1/2 ΔH₃(Cl₂(g)) - ΔH₁(Mg2+(g)) = -2220 kJ/mol
IE(Mg) = ΔH₁(Mg(g)) = +2188 kJ/mol
EA(Cl) = ΔH₂(Cl(g)) = -337 kJ/mol
H₂(Cl₂) = 0 (since Cl₂ is in the gas phase)
DH(f)(MgCl₂) = ΔH₃(Mg(s), Cl₂(g), MgCl₂(s)) = -642 kJ/mol
Substituting these values into the equation for the lattice energy, we get:
LE(MgCl₂) = -2220 + 2188 - 337 + 1/2(0) - (-642) = -3509 kJ/mol
Therefore, the lattice energy of MgCl₂ is approximately -3509 kJ/mol.
What is the name in a position called
The names of the positions are called:
(1) (10) Atomic number
(2) (11) Chemical symbols
(3) (12) Elements
(4) (13) Atomic mass
What is an atomic structure?Atomic structure refers to the composition and arrangement of subatomic particles within an atom. An atom consists of a central nucleus, which contains positively charged protons and uncharged neutrons, surrounded by negatively charged electrons that move around the nucleus in shells or energy levels.
The number of protons in the nucleus determines the atomic number and thus the identity of the element. The arrangement of electrons around the nucleus determines the chemical and physical properties of the element.
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The questions are:
10 What is the name for the number in this position called? (the answer is not "6") →6
11 What is the name for the letter in this position called? (the answer is not "C"!) →C
12 What is the name in this position called? (the answer is not "Carbon"!) →Carbon
13
What is the name for the number in this position? (the answer is not "12.0") →12.0
Use the spaces below to type your answers to the questions above.
Weigh magnesium metal Complete the following steps: Place weighing paper on balance Use forceps to place magnesium o balance. Record exact mass in Lab Data Calculate moles of magnesium. Record in Lab Data Use forceps to place magnesium on bench near wires and stopper 0.215 g TARE Mass of magnesium (g) Moles of magnesium (mol) Temperature of water (°C) Temperature of water (K) Vapor pressure of water (mmHg) Barometric pressure (mmHg) 0.198 9
Moles of magnesium = 0.198 g / 24.31 g/mol = 0.00815 mol
What are the moles?
Based on the given data, we can calculate the moles of magnesium using the following formula:
moles of magnesium = mass of magnesium (g) / molar mass of magnesium
The molar mass of magnesium is 24.31 g/mol.
Thus, moles of magnesium = 0.198 g / 24.31 g/mol = 0.00815 mol
It seems that the experiment involves determining the mass and moles of magnesium. The temperature of water, vapor pressure of water, and barometric pressure are likely additional data points collected during the experiment for further analysis.
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draw a mechanism showing the penta-coordinate intermediate and the formation of the phosphorylated intermediate (which is an anhydride)
The formation of the phosphorylated intermediate (an anhydride) involves the formation of a penta-coordinate intermediate. This intermediate is formed by a nucleophilic attack of the sulfur on the phosphorus atom of the phosphate group.
In this mechanism, the sulfur atom of the sulfate group nucleophilically attacks the phosphorus atom of the phosphate group to form a penta-coordinate intermediate. This intermediate then rearranges to form a phosphorylated intermediate, which is an anhydride.
Mechanism showing the penta-coordinate intermediate and the formation of the phosphorylated intermediate are given as follows:
Step 1: Alkyl Phosphate Formation : The first step of the mechanism includes the formation of an alkyl phosphate. A proton is abstracted by OH− from the phosphate group to create the alkyl phosphate. The base catalyzes this step.
Step 2: Binding to Mg2+After the alkyl phosphate is created, the magnesium ion binds to it.
Step 3: Nucleophilic attack: Following that, the nucleophilic attack happens, with the nucleophile being the water molecule. It is coordinated with the magnesium ion. It occurs at phosphorus, causing it to be phosphorylated. It results in the creation of a pentacoordinate intermediate.
Step 4: Release of Orthophosphate: Orthophosphate is released as a result of the reaction between pentacoordinate intermediate and water. It results in the creation of a diester intermediate.
Step 5: Subsequent Hydrolysis: In the final step, the intermediate diester is hydrolyzed to form orthophosphate and the final product. This is accomplished via nucleophilic substitution.
The end result is a free phosphate group that is bound to the alcohol's oxygen. A phosphate anhydride is formed in the process.
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Using C2H4 + 3 O2 -> 2 CO2 + 2 H2O. If 20 moles of fuel are combusted in the above equation, how many moles of CO2 are produced?
Question 8 of 10
Which of the following diagrams is the correct electron dot diagram for Al?
O A.
OB.
О с.
O D.
..
•Al:
:AI:
•AI.
:AI.
Please help I need it asap!!!
Answer:
The correct electron dot diagram for Al is option A:
•Al:
:AI:
Explanation:
0.10 molL-1 NaCl solution contains 1.0 mole of NaCl
The volume of the 0.10 molL⁻¹ NaCl solution which contains 0.1 mole of sodium chloride, NaCl is 1 L
How do i determine the volume of the solution?Molarity of a solution is defined by the following formula:
Molarity = mole / volume
Cross multiply
Molarity × volume = Mole
Divide both sides by molarity
Volume = mole / molarity
With the above formula, we can obtain the volume of the solution. Details below:
Molarity of solution = 0.10 molL⁻¹Mole of NaCl = 0.1 moleVolume of solution =?Volume = mole / molarity
Volume of solution = 0.1 / 0.1
Volume of solution = 1 L
Thus, we can conclude that the volume of the solution is 1 L
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Complete question:
0.10 molL⁻¹ NaCl solution contains 1.0 mole of NaCl. What is the volume of the solution?
18.35 mL of a solution of the acid H₂C₂O4 is titrated, and 58.20 mL of 0.4700-M NaOH is required to reach the equivalence point.
Calculate the original concentration of the acid solution.
The original concentration of the H₂C₂O4 solution is 0.7455 mol/L.
What is the original concentration of the acid solution?The balanced chemical equation for the reaction between H₂C₂O4 and NaOH is:
H₂C₂O4 + 2NaOH → Na₂C₂O₄ + 2H₂O
From this equation, we can see that the acid reacts with the base in a 1:2 ratio, meaning that one mole of H₂C₂O4 will react with two moles of NaOH.
To find the original concentration of the acid solution, we need to use the formula for calculating molarity:
Molarity = moles of solute / volume of solution (in liters)
We can start by calculating the number of moles of NaOH used in the titration:
moles of NaOH = Molarity x volume of NaOH used (in liters)
moles of NaOH = 0.4700 mol/L x 0.05820 L
moles of NaOH = 0.027354 moles
Since the acid and base react in a 1:2 ratio, we know that the number of moles of H₂C₂O4 is half the number of moles of NaOH used:
moles of H₂C₂O4 = 0.027354 moles / 2
moles of H₂C₂O4 = 0.013677 moles
Now we can use the formula for molarity to calculate the original concentration of the acid solution:
Molarity of H₂C₂O4 = moles of H₂C₂O4 / volume of H₂C₂O4 used (in liters)
Molarity of H₂C₂O4 = 0.013677 moles / 0.01835 L
Molarity of H₂C₂O4 = 0.7455 mol/L
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why can't the enthalpy of formation of calcium carbonate be determined directly?
The enthalpy change can not be measured directly because you have to take into account how much energy was put into the reaction in the first place.
Hope this helps!!! :)
The standard enthalpy of formation of all elements in their standard states are assumed to be zero. It is not possible to determine the enthalpy of formation of calcium carbonate as it is formed from other compounds.
What is enthalpy of formation?The standard enthalpy of formation of a compound can be defined as the enthalpy change accompanying the formation of one mole of the compound from its constituent elements, all the substances being in their standard states.
The standard enthalpy of formation is usually denoted as ΔfH⁰. For example the enthalpy of formation of CO₂ and CH₄ are -393.5 kJ mol⁻¹ and -74.8 kJ mol⁻¹ respectively.
Here CaCO₃ is formed by the reaction:
CaO + CO₂ → CaCO₃
The enthalpy change for the given reaction is not an enthalpy of formation of CaCO₃. Since CaCO₃ is not formed from its constituent elements.
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When a mineral breaks along a weekly bonded plane it is called
Answer: Cleavage
Explanation:
When a mineral breaks along a weekly bonded plane it is called cleavage
Find the mass of 2 moles of carbon tetrachloride
Answer:
The mass of 2 moles of carbon tetrachloride is
307.646 grams
Explanation:
The chemical formula for Carbon tetrachloride is [tex]\ce{CCl_4}[/tex]. It contains 1 carbon atom and 4 chlorine atoms.
Carbon tetrachloride is formed due to the covalent bond between one carbon atom with four chlorine atoms.
In order to find the mass of 2 moles of [tex]\ce{CCl_4}[/tex] we need to determine the molar mass.
The molar mass of carbon is 12.011 g/mol.
The molar mass of chlorine is 35.453 g/mol.
As stated before we have 1 carbon atom and 4 chlorine atoms. So the molar mass can be evaluated by
[tex]\left(1*12.011\right)+\left(35.453*4\right)=153.823[/tex]
The molar mass of [tex]\ce{CCl_4}[/tex] is 153.823 g/mol.
You can multiply that by 2 to get the mass in grams of 2 moles of carbon tetrachloride.
[tex]2*153.823 =307.646[/tex]
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Identify the Lewis acid and the Lewis base in each the following reactions. (Omit states of matter.) a. B(OH)2(aq) + H2O(l) + B(OH)4 - (aq) + H+ (aq) Acid: Base: b. H2O(1) + CN- (aq) + HCN(aq) + OH- (aq) Acid: Base: C. HgI,(s) +21+ (aq) → Hg1,2(aq) Acid: Base:
Base: Water, b. [tex]HCN[/tex] Acid Base [tex]OH-[/tex] , c. Base: I- Acid:[tex]HgI2[/tex] . Chemical substances known as acids have the ability to donate a proton [tex](H+)[/tex] to a base or another molecule.
Chemical substances known as acids have the ability to donate a proton [tex](H+)[/tex] to a base or another molecule. They have a sour flavour, have the power to dissolve metals, and can make litmus paper turn red. On the pH scale, where 7 is neutral and lower numbers indicate higher acidity, acids have a pH below 7. Hydrochloric acid, sulfuric acid, and acetic acid are a few typical examples of acids. Acids are essential for many chemical processes, such as digestion, the creation of energy, and the synthesis of numerous significant chemicals. Also, they are employed in a number of sectors, such as industry, food production, and agriculture.
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what is the formula for co3+ and se2-?
The formula for Co3+ is Co3+ because it represents the ion of cobalt that has lost three electrons, leaving it with a 3+ charge.
What is chemical formula and how they are formed ?
A chemical formula is a symbolic representation of a chemical compound that shows the types of elements present in the compound and the relative number of atoms of each element. For example, the chemical formula for water is H2O, which indicates that it is made up of two hydrogen atoms and one oxygen atom.
Chemical formulas are formed by identifying the elements that make up a compound and determining the relative number of each element in the compound. The number of each element is represented by a subscript following the chemical symbol of the element. For example, the chemical formula for methane is CH4, which indicates that there is one carbon atom and four hydrogen atoms in each molecule of methane.
The formula for Se2- is Se2- because it represents the ion of selenium that has gained two electrons, giving it a 2- charge.
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what does 2NaOH equal
WHAT IS THE OXIDATION NUMBER OF SULFUR IN THE S2O8 ION?
Answer: The Oxidation State Of Sulphur is +6
Explanation:
Identify each of the following orbitals, and determine the n and quantum numbers. Explain your answers.
(a) one radial node the Number of radial nodes = n - l - 1
And number of angular nodes = l
n = 3 and l = 1
Orbital is 3p.
(b) It has zero angular node hence s-orbital and there is 1 radial node . 1 = n - 0 - 1 ; n = 2 and l = 0
The orbital is 2s.
(c) the shape of the orbital is that of dz². There is two angular nodes and there is no radial node.
n = 3 and l = 2
Hence the orbital is 3dz².
What is radial node?In atomic physics, a radial node is a point in space where the probability density of finding an electron in an atom is zero. It is a type of nodal plane that occurs in atomic orbitals, which are regions of space where electrons are most likely to be found.
Radial nodes occur in the radial distribution function of an atomic orbital, which describes the probability density of finding an electron at a given distance from the nucleus. The number of radial nodes in an atomic orbital is equal to n - l - 1, where n is the principal quantum number and l is the azimuthal quantum number.
Radial nodes represent regions of space where the radial wave function of the electron changes sign.
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match each substance correctly to the principal type(s) of intermolecular force(s) present, other than covalent bonding.
Substance intermolecular force
CH2OH ---> Hydrogen bonding
CH3F --> Dipole-dipole forces
C3H8 --> Dispersion forces
CaCL2 --> Ionic bonding
The intermolecular force present in CH2OH is hydrogen bonding. The intermolecular force present in CH3F is Dipole-dipole forces. Ionic bonding is defined as a type of chemical bonding that involves the electrostatic attraction between oppositely charged ions or between two atoms with sharply different electronegativities. It is the primary interaction occurring in ionic compounds. Hydrogen bonding results from the attractive force between a hydrogen atom covalently bonded to a very electronegative atom such as a N, O, or F atom and another very electronegative atom.
Dipole-dipole forces are defined as a attractive forces between the positive end of one polar molecule and the negative end of another polar molecule. Dispersion force is defined as a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles.
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The complete question is,
Match each substance correctly to the principal type(s) of intermolecular force(s) present, other than covalent bonding.
CH2OH Ionic bonding
CH3F Hydrogen bonding
C3H8 Dispersion forces
CaCL2 Dipole-dipole forces
Calculate Delta H r* n for Ca(s) + 1/2 * O_{2}(g) + C*O_{2}(g) -> CaC*O_{3}(s)
a. -813.4 kJ. enthalpy of the reaction is -813.4 kJ
One of the characteristics of a thermodynamic system is enthalpy, which is calculated by multiplying the internal energy of the system by the sum of its pressure and volume. The total enthalpy of a system cannot be directly calculated because the internal energy's components are either unknown, hard to access, or unimportant to thermodynamics.The overall reaction can be represented as: [tex]Ca(s) +\frac{ 1}{2}O_2(g) + CO2(g) \rightarrow CaCO_3(s).[/tex]
The reaction enthalpy [tex](\Delta H_{rxn})[/tex]is the result of adding the reaction's separate enthalpies.The enthalpy of each of the individual reactions is given as:
[tex]Ca(s) + \frac{1}{2}0_2(g) \rightarrow Cao(s) \Delta H_{rxn} = -635.1 kJ CaCO_3(s) \rightarrow Cao(s) + CO2(g) \Delta H_{rxn} = 178.3 kJ[/tex]
Therefore, the overall enthalpy change for the reaction is given as:
[tex]\Delta H_{rxn} = \Delta H_{rxn}(Ca(s) +\frac{ 1}{2}0_2(g) \rightarrow Cao(s)) +\Delta H_{rxn} (CaCO_3(s) \rightarrow Cao(s) + CO2(g))[/tex]
[tex]\Delta H_{rxn} = -635.1 kJ + 178.3 kJ \Delta H_{rxn} = -813.4 kJ[/tex]
Therefore,The reaction's enthalpy is -813.4 kJ.
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complete question:Calculate delta Hrxn for Ca(s) + 1/202(g) + CO2(g) => CaCO3(s) given the following set of reactions: Ca(s) + 1/202(g) => Cao(s) delta Hrxn = -635.1 kJ CaCO3(s) => Cao(s) + CO2(g) delta Hrxn = 178.3 kJ a. -813.4 kJ
b. -456.8 kJ
c. 813.4 kJ
d 456.8 kJ
e. None of these is within 5% of the correct answer.
Need BIO help with both questions
Answer:
6. The light being reflected off changes the color shown
7. The bottom, the sugar looses its positive charge
Explanation:
Calculate the mass of benzene that should be dissolved in 425g of water at 35°C to produce a
solution with a vapor pressure of 36.1 mmHg.
(At 35°C, P0H20 = 42.2mmHg)
The mass of benzene that should be dissolved in 425g of water at 35°C to produce a solution with a vapor pressure of 36.1 mmHg is approximately 10.02 g.
1. Calculate the mole fraction of benzene (Xbenzene) in the solution using the following equation:
Ptotal = Xbenzene x P0benzene + Xwater x P0water
where Ptotal is the total vapor pressure of the solution, P0benzene is the vapor pressure of pure benzene, P0water is the vapor pressure of pure water, and Xwater = 1 - Xbenzene.
Rearranging the equation to solve for Xbenzene:
Xbenzene = (Ptotal - Xwater x P0water) / P0benzene
Substituting the given values:
Xbenzene = (36.1 mmHg - 0.953 x 42.2 mmHg) / 95.1 mmHg
Xbenzene = 0.390
2. Calculate the molality of the solution using the following equation:
molality = moles of solute / mass of solvent in kg
moles of solute = molality x mass of solvent in kg
Substituting the given values:
molality = 0.390 mol / kg
mass of solvent = 425 g = 0.425 kg
moles of solute = 0.390 mol / kg x 0.425 kg
moles of solute = 0.166 mol
3. Calculate the mass of benzene using its molar mass:
mass of benzene = moles of benzene x molar mass of benzene
Substituting the given values:
moles of benzene = 0.166 mol
molar mass of benzene = 78.11 g/mol
mass of benzene = 0.166 mol x 78.11 g/mol
mass of benzene = 12.97 g
However, we assumed that the density of the solution is equal to the density of water, which is not the case. Therefore, we need to adjust the mass of benzene by using the following equation:
mass of benzene = mass of solute / (1 - mass fraction of solute)
4. Calculate the mass fraction of benzene using the mole fraction:
mass fraction of benzene = (Xbenzene x molar mass of benzene) / (Xbenzene x molar mass of benzene + Xwater x molar mass of water)
5. Substituting the given values:
molar mass of water = 18.02 g/mol
mass fraction of benzene = (0.390 x 78.11 g/mol) / (0.390 x 78.11 g/mol + 0.610 x 18.02 g/mol)
mass fraction of benzene = 0.097
Substituting the values in the mass equation:
mass of benzene = 12.97 g / (1 - 0.097)
mass of benzene = 10.02 g
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Calculate the hydronium ion concentration, [H3O+], for a solution with a pH of 6.82.
[H₂0¹] =
M
The hydronium ion concentration, [H+] of a solution with a pH of 6.82 is 1.51 × 10-⁷ M.
How to calculate hydrogen ion concentration?The hydrogen or hydronium ion concentration of a solution can be calculated from the pH using the following formula;
pH = - log {H+}
[H+] = 10−pH
by exponentiating both sides with base 10, we can "undo" the common logarithm.
{H+} = 10-⁶.⁸²
{H+} = 0.000000151356
[H+] = 1.51 × 10-⁷ M
Therefore, the hydronium ion concentration with a pH of 6.82 is 1.51 × 10-⁷ M.
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Choose the correct answer.
The correct reaction equation is; Sr(OH)2 ----> Sr + 2OH
How do you know a correct reaction equation?A correct chemical reaction equation must follow the law of conservation of mass, which states that matter cannot be created or destroyed, only transformed from one form to another. This means that the total number of atoms of each element on the reactant side of the equation must be equal to the total number of atoms of each element on the product side.
To ensure that an equation is correct, you should first check that the chemical formulas of the reactants and products are correct. You can then balance the equation by adjusting the coefficients in front of each chemical formula so that the number of atoms of each element is the same on both sides of the equation.
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A student sets up a titration with a * 1 point buret filled with 0.5 M NaOH. In the flask below they place the phenolphthalein indicator and 6.2 mL of the unknown acid. The solution in the beaker turns pink after exactly 24.8 mL of NaOH have been added. The student repeats this experiment but this time they do it with a buret filled with 1.0 M NaOH which is more concentrated than the original experiment. Would the solution in the test tube turn pink sooner, later, or around the same amount of added NaOH?
Answer:
The solution in the test tube would turn pink earlier with the more concentrated NaOH solution.
This is because the concentration of the NaOH solution is directly proportional to the number of moles of NaOH per unit volume of the solution.
So, with a more concentrated NaOH solution (1.0 M compared to 0.5 M), each mL of NaOH solution contains twice as many moles of NaOH.
Therefore, it would take half as much volume (i.e., 12.4 mL instead of 24.8 mL) of the 1.0 M NaOH solution to react with the same number of moles of the unknown acid as the 0.5 M NaOH solution.
How does a phase change affect a thermochemical equation?
O It alters the products.
O It alters the moles of reactants.
O It affects the balance of the equation.
O It can affect the AH value.
The correct answer is option D, It can affect the AH value.
What is a phase change?A phase change is a physical change in a substance in which the substance's state of matter is changed, such as from a gas to a liquid or from a liquid to a solid. It is also known as a phase transition.
Phase changes also involve changes in energy, temperature, and pressure. For example, when a solid melts to become a liquid, it absorbs energy and the temperature rises. When a liquid boils to become a gas, energy is released and the temperature decreases. Similarly, when a gas condenses to become a liquid, energy is released and the pressure increases.
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