TIMED HELP ASAP
19.11 g of MgSO₄ is placed into 100.0 mL of water. The water's temperature increases by 6.70°C. Calculate ∆H, in kJ/mol, for the dissolution of MgSO₄. (The specific heat of water is 4.184 J/g･°C and the density of the water is 1.00 g/mL). You can assume that the specific heat of the solution is the same as that of water.
Answer:
TIMED HELP ASAP
19.11 g of MgSO₄ is placed into 100.0 mL of water. The water's temperature increases by 6.70°C. Calculate ∆H, in kJ/mol, for the dissolution of MgSO₄. (The specific heat of water is 4.184 J/g･°C and the density of the water is 1.00 g/mL). You can assume that the specific heat of the solution is the same as that of water.
Answer:
-21.03 kJ/mol
Explanation:
∆H is enthalpy. Enthalpy is the total heat content of a system.
So we can establish that ∆H = q (heat)
The formula for heat (q)
q = cm∆T
c = specific heat capacity
m = mass of substance
∆T= change of temperature
Since we are calculating the enthalpy of the SOLUTION. We must account for both the mass of water and the mass of MgSO₄ in our q formula.
All you gotta do is plug and chug at this stage.
∆H = q = cm∆T = (4.184)(19.11+100.0)(6.70) = 3338.986808 Joules
We have now calculated the heat (aka enthalpy) of the solution.
BUT
Remember! The problem asked for enthalpy in kj....
Use this conversion factor.
1000 J = 1 kJ
3338.986808 Joules * 1kJ/1000 J = 3.338986808 kJ
We were asked to find ∆H for the dissolution of MgSO4 in units of kj/mol so we are not finished.
Take the grams of MgSO4 in the problem and convert it into moles using its molar mass.
MgSO4 molar mass = 120.3676 g
1 mol = 120.3676 g MgSO4 <---- Use this as a conversion factor
19.11 g MgSO4 * 1 mol MgSO4/120.3676 g = 0.15876365 mol MgSO4
Now that you've calculated the moles of MgSO4 in this solution. You can divide your heat by it.
q dissolution = 3.338.986808 kJ/ 0.15876365 mol = 21.03 kj/mol
Note that the problem tells us that the temperature of water increases.
This means that the water is experiencing an endothermic process (heat is being absorbed from MgSO4) . Mathematically, this would be indicated by a positive sign. ---> +q
We can assume MgSO4 is losing heat as it is placed into the water. It is experiencing an exothermic process (heat is being lost). Mathematically, this would be indicated by a negative sign. ----> -q
So if we're calculating the enthalpy for the dissolution of MgSO₄ ....the value we've arrived at must be negative.
Answer
∆H = 21.03 kj/mol :)))))
I hope that helped...I feel like my explanation was a bit convoluted.
A common oxidizing agent is..?
A. KI
C. KMnO4/H+
B. FeSO4
D. concentrated HCl
Answer:
C. KMnO4/H+
Explanation:
Oxidizing agent is a substance that has the ability to accept electrons from other substances.
Calculate the number of moles of calcium hydroxide in a 48.6-g
Explanation:
number of moles=mass/molecular mass
molecular mass of calcium hydroxide=74
n=m/mr
=48.6/74
=0.65g/mol
I hope it helps
The number of moles of calcium hydroxide in a 48.6 g is 0.65 mol
What is Mole concept ?The mole, symbol mol, is the SI base unit of amount of substance.
The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample.
Formula used :
Number of moles = mass / molecular mass
Molecular mass of calcium hydroxide = 74
n = m / mm
= 48.6 / 74
= 0.65 mol
Therefore, The number of moles of calcium hydroxide in a 48.6 g is 0.65 mol
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what is the molecular weight of potassium ( k2so4)
Answer:
174.259 g/mol
Explanation:
The molecular weight of potassium (K2so4) is 174.259 g/mol .
Hope it is helpful to you
How does kinetic energy transform into potential energy?
nguyên tử sắt có điện tích hạt nhân là 26+. trong nguyên tử, số hạt mang điện nhiều hơn số hạt không mang điện là 22. Hãy xác định số khối của nguyên tử sắt
Answer:
I don't know yr language
NaC2H3O2 product or reactant
Answer:
the reaction between vinegar and baking soda, the reactants are vinegar (acetic acid) and baking soda (sodium bicarbonate). The products are sodium acetate, water, and carbon dioxide gas.
Chromium forms a complex with diphenylcarbazide whose molar absorptivity is 4.17*10^4 at 540nm. Calculate the absorbance of a 7.68*10^-6 M solution of the complex at 540nm when measured in a 1.00cm cell and the transmittance of the solution.
Answer:
0.32 liters/mole cm.
Explanation:
According to Beer Lambert's law;
A= εcl
ε = molar absorptivity
c= concentration
l= path length
A= 4.17*10^4 × 7.68*10^-6 × 1
A= 0.32 liters/mole cm.
hii pls help me to write the ionic equation
Answer:
net ionic equation
[tex]\boxed{ SO_4{}^{2-} {}_{(aq.)} + Ba^{2+} {}_{(aq.)} \rightarrow BaSO_4 {}_{(s)}} [/tex]
Sea floor spreading occurs at a mid-ocean ridge true or false
Answer:
False
Explanation:
sea floor spreading is not consistent at all mid ocean ridges.
PLEASE HELP!!
Balance the equation below to answer the question. Suppose you mix 3.25 grams of nitrogen trihydride with 3.50 grams of oxygen gas. How many grams of nitrogen monoxide would you make?
A. 2.63 grams
B. 2.11 grams
C. 4.34 grams
D. 3.45 grams
E. 1.76 grams
what is Ka for hno2(aq) = h+(aq) + no2-(aq)?
The ionization constant of an acid is denoted by the symbol Kₐ. The smaller the value of Kₐ for an acid, the weaker will be the acid. Thus the correct option is D.
What is acid dissociation constant?The acid dissociation constant denotes the measure of the extent to which an acid dissociates in the solution. The strength of an acid is represented by the value Kₐ. The less an acid dissociates, smaller will be the value of Kₐ, the stronger the acid, higher will be the value of Kₐ.
The dissociation of HNO₂ is given as:
HNO₂ (aq) ⇄ H⁺ (aq) + NO₂⁻ (aq)
The dissociation constant of HNO₂ is given as:
Kₐ = [H⁺][NO₂⁻] / HNO₂
The value of Kₐ is constant at a particular temperature. We can use this fact to find out the pH of a weak acid at a particular temperature.
Thus the correct option is D.
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PLEASE HELP QUICK!!! How many molecules are there in 4.00 L of
glucose, C6H1206? Please show your work!!
How are the vapor pressure and boiling point of alkynes affected as the chain length increases?
Answer:
Answer to the following question is as follows;
Explanation:
Alkynes' vapour pressure and normal boiling points are altered when chain length grows, since vapour pressure rises while boiling point falls.
Vapour pressure always include pressure entered by vapour with its condensed phase, pressure include molecules force of attraction include vapour
what is S in the equation G= H-T delta S?
Answer:
C
Explanation:
∂S represents change in entropy.
What is the total pressure in millimeters of mercury,
exerted by the gas mixture
P= _______ units?
Answer:
87059.50558 pa
Explanation:
Dalton's law of partial pressure states that Ptotal=P1 +P2+ P3
417mmHg + 150mmHg +86mmHg =653 mmHg
convert it to Pa, your answer is 87059.50558Pa.
I hope I'm of help to you
What is the pH of a 1.0 x 10-3 M KOH solution?
A. 10
B. 4.0
C. 11
D. 3.0
Answer:
Option C. 11
Explanation:
We'll begin by calculating the concentration of the hydroxide ion [OH¯] in the solution. This can be obtained as follow:
In solution, KOH will dissociate as follow:
KOH (aq) <=> K⁺(aq) + OH¯(aq)
From the balanced equation above,
1 mole of KOH reacted to produce 1 mole of OH¯.
Therefore, 1×10¯³ M KOH will also react to produce 1×10¯³ M OH¯.
Thus, the concentration of hydroxide ion [OH¯] in the solution is 1×10¯³ M
Next, we shall determine the pOH of the solution. This can be obtained as follow:
Concentration of hydroxide ion [OH¯] = 1×10¯³ M
pOH =?
pOH = –Log [OH¯]
pOH = –Log 1×10¯³
pOH = 3
Finally, we shall determine the pH of the solution. This can be obtained as follow:
pOH = 3
pH =?
pH + pOH = 14
pH + 3 = 14
Collect like terms
pH = 14 – 3
pH = 11
PLZ HELP According to the atomic model Which particles are found In the same part of the atom
a. protons electrons neutrons
B.protons and neutrons
C.protons and electrons
D.electrons and neutrons
Exprese la concentración de una solución de H3PO4 al 30 % en masa y con una densidad de 1.39 g/mL en: M, y N.
Respuesta:
4.26 M; 12.8 N
Explicación:
Primer paso: Calcular la concentración volumétrica (Cv)
Usaremos la siguiente expression.
Cv = Cg × ρ
Cv = 30 g%g × 1.39 g/mL = 41.7 g%mL
Segundo paso: Calcular la molaridad
La concentración volumetrica es 41.7 g%mL, es decir, hay 41.7 gramos de soluto cada 100 mL de solución. Usaremos la siguiente fórmula para molaridad.
M = masa de soluto / masa molar de soluto × litros de solución
M = 41.7 g / 97.99 g/mol × 0.1 L = 4.26 M
Tercer paso: Calcular la normalidad
Usaremos la siguiente fórmula.
N = M × Z
donde Z para un ácido es igual al número de protones.
N = M × Z
N = 4.26 mol/L × 3 eq/mol = 12.8 N
If 30.0 grams of AlC3 is produced in the reaction, how many grams of HCI must have reacted?
Answer:
Al2O3 + 6HCl ==> 2AlCl3 + 3H2O ... balanced equation
moles Al2O3 present = 30.0 g x 1 mol/101.96 g = 0.294 moles
moles HCl present = 30 g HCl x 1 mol/36.5 g = 0.822 moles HCl
HCl is LIMITING as it takes 6 moles HCl for each 1 mol Al2O3 and here that is not enough. It will run out first.
Now, using the limiting reactant, we find the moles and mass of AlCl3 that can be formed.
0.822 moles HCl x 2 moles AlCl3/6 moles HCl = 0.274 moles AlCl3 formed
mass of AlCl3 = 0.274 moles AlCl3 x 133 g/mole = 36.4 g AlCl3 formed
I NEED HELP WITH THE LAST 4 BOXES PLEASEEEEEEE
Answer:
0.68°C and 0°C.
Explanation:
The average freezing point of sucrose is 0.68°C whereas the average freezing point is 0°C. Both at these temperatures, turn from liquid into solid state. This point is also called transition point because at this point transition of state occurs of both compounds. When the temperature increases, this solid state is again turn into liquid form so temperature is responsible for this change of states of sucrose and water.
Which of the following steps correctly converts 1.25 moles of fluorine to an equivalent mass of fluorine in grams? (5 points)
Add 1.25 to the atomic mass of fluorine.
Divide the atomic mass of fluorine by 1.25.
Subtract 1.25 from the atomic mass of fluorine.
Multiply the atomic mass of fluorine by 1.25.
Explanation:
Given the amount of fluorine is ---- 1.25 mol.
What is the mass of given fluorine in grams?
Since
[tex]Number of moles =\frac{given mass of the substance}{its molecular mass}[/tex]
To get the mass of the substance in grams, multiply the given number of moles with the molecular mass of the substance.
Hence, among the given options, the correct answer is the last option that is
Multiply the atomic mass of fluorine by 1.25.
Answer:
Multiply the atomic mass of fluorine by 1.25.
Explanation:
i got it right on the exam!! :)
is SrO a conductor of electricity
Answer:
No and Yes
Explanation:
it depends bc its an ionic compound, therefore can't conduct electricity when SOLID, BUT unless it DISSOLVES in water it can conduct
Is this population more likely to grows slowly or quickly in the next 10 years
nobody can say it is uncertain but in my opinion it will grow quickly in the next 10 years
Use VSEPR theory to predict the electron-pair geometry and the molecular geometry of CH3Cl. a. The electron-pair geometry is linear, the molecular geometry is linear. b. The electron-pair geometry is tetrahedral, the molecular geometry is trigonal-pyramidal. c. The electron-pair geometry is trigonal-planar, the molecular geometry is bent. d. The electron-pair geometry is tetrahedral, the molecular geometry is tetrahedral. e. The electron-pair geometry is trigonal-planar, the molecular geometry is trigonal planar. Group of answer choices
Answer:
d. The electron-pair geometry is tetrahedral, the molecular geometry is tetrahedral.
Explanation:
According to Valence Shell Electron Pair Repulsion Theory, the shape of a molecule depends on the number of electrons pairs surrounding the valence shell of the central atom in the molecule.
In CH3Cl, the central atom is carbon. Carbon has four regions of electron density surrounding it and no lone pairs. Lone pairs cause molecules to deviate from the expected geometry.
Since CH3Cl has no lone pairs on the carbon central atom, both the molecular and electron pair geometries are tetrahedral.
In CH₃Cl, the electron-pair geometry is trigonal-planar, and the molecular geometry is bent. Therefore, option C is correct.
According to VSEPR (Valence Shell Electron Pair Repulsion) theory, the electron pairs around the central atom in CH₃Cl will arrange themselves to minimize repulsion, resulting in a specific geometry.
In CH₃Cl, the central atom is carbon (C), and it is surrounded by three hydrogen atoms (H) and one chlorine atom (Cl).
The electron-pair geometry is determined by the arrangement of these electron pairs.
Molecular geometry considers only the atoms around the central atom, not the lone pairs.
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Name each compound. Do not capitalize element names. An example can be seen
below.
Ex. SF6: sulfur hexfluoride
a. H2O:
b. PC15:
C. SiF4:
d. N20
Answer:
a. H2O: dihydrogen monoxide
b. PCl5: Phosphorus pentachloride
c. SiF4: Silicon tetrafluoride
d. N20: dinitrogen oxide
what is transition state
Answer:
transition state is a point in which electrons been removed from the atom
Answer:
The highest energy structure in the reaction coordinate.
Explanation:
what are the intermolecular forces of Sulfate ion
Answer:
oh it's easy
Explanation:
Take the hydrate
N
a
2
S
2
O
3
∙
5
H
2
O
. Are there ionic forces between the
N
a
+
and the
S
2
O
2
−
3
and ion-dipole forces between the cation/anions and the water?
make a 450 gram solution with the mass by mass concentration of 7% how much salt and water do you need to mix
Which diagram represents this molecule
Answer:
I think it is C
Explanation:
Hope this helps!! :)
If I'm wrong, then greatest apologies
