Answer: bạn viết phương trình Phenol + NaOH
=> nNaOH = nPhenol = 0,2 mol
m Phenol = 0,2x94 = 18,8 gam
%mPhenol = 18,8/28,9% = 65,05
Explanation:
what is the organic molecule
Answer:
kinetic energy is the molecules
Explanation:
A molecule of the kind normally found in living systems. Organic molecules are usually composed of carbon atoms in rings or long chains, to which are attached other atoms of such elements as hydrogen, oxygen, and nitrogen.
Specific heat capacity is _____.
greater for metal than for wood
the amount of heat required to raise the temperature of 1g of a substance 1 oC
represented by the symbol, Q
all of these
Answer:
all of this
Explanation:
Fe2O3 +3CO--2Fe+3CO2 .identify the substance oxidized ,reduced and oxidizing agent and reducing agent
Answer:
Oxidized : CO
Reduced: Fe
Oxidizing agent: Fe2O3
Reducing agent: CO
Explanation:
Loss of electrons is oxidation while gaining of electrons is reduction.
CO is a reducing agent, Fe2O3 is an oxidizing agent.
Each carbon atom is oxidized in CO. CO is the reducing agent
Each Fe atom in FeO3 is reduced. FeO3 is the oxidizing agent
How much water will the measuring cup have if you poured 1/2 of it out?
mention two factors which affect pressure due to liquid contained in a vessel
Answer:
depth of the liquid and nature of liquid affects the pressure due to liquid contained in a vessel
Answer:
Two factors influence the pressure of fluids. They are the depth of the fluid and its density. A fluid exerts more pressure at greater depths
Determine the mass of 6.33 mol of iron(II) nitrate.
Answer:
1822.72 g
Explanation:
Applying,
n = R.M/M.M.................. Equation 1
Where n = number of moles of iron(II) nitrate, R.M = Reacting mass of iron(II) nitrate, M.M = molar mass of Iron(II) nitrate.
Make R.M the subject of the equation
R.M = n×M.M............. Equation 2
From the question,
Given: n = 6.33 mol
Constant: M.M of iron(II) nitrate = 287.95 g/mol
Substitute these values into equation 2
R.M = 6.33(287.95)
R.M = 1822.72 g
Hence the mass of iron(II) nitrate is 1822.72 g
A mixture of reactants and products for the reaction shown below is at equilibrium in a 5.0 L container what would most likely happen to the equilibrium if the volume of the container will reduced to 3.0 L?
Since the volume decreased, it means that the pressure is going to rise. Thus, the equilibrium of the reaction will shift in the direction that has the least amount of moles.
The statement, that describes the equilibrium "will change in the direction with the minimum moles."
What is an equilibrium?A condition of equilibrium has become one of balance. Chemical equilibrium is the state in which both the reactants and products are present in concentrations that have no further tendency to change with time, resulting in no observable change in the system's properties.
When volume decreases, the equilibrium shifts to favor the direction that produces fewer moles of gas. When the volume is raised, the equilibrium shifts in favor of the direction that produces the most moles of gas. Because the container's volume will be lowered from 5.0 L to 3.0 L, the pressure will rise. As a result, the equilibrium of the reaction will shift in the direction with the fewest moles. When the volume is reduced, the pressure rises. This demonstrates that a gas's pressure is inversely proportional to its volume.
Hence the correct answer is equilibrium will change in the direction with the minimum moles.
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What is the boiling point of water?
Answer:
212°F , 100°C , 373.15°K
They are all the same, in different units.
Answer:
The boiling point of water is 212 degrees fahrenheit, and/or 100 degrees celsius.
Re-word this statement: Ionic Radii are changing as you move down the column because the atoms in lower rows have more energy levels, which makes the valence electrons farther from the nucleus, so it takes less energy for them to be pulled away.
The Ionic radii are changing as you move across a row because each element has one more proton, which increases the attraction of the nucleus.
Answer:
ty po hehe
Explanation:
mark me as brainliest po thank you
Calculate the molar mass of the following compound: Ca3P2
Answer:
The molar mass of the compound given is 182.182 g/mol.
Explanation:
To calculate the molar mass of the compound, we must multiply the number of moles of each element by the the individual molar mass of each element and add them together.
Let's start with Calcium. The molar mass of Calcium is 40.078. In this compound, we have three moles of Calcium, so we should multiply this number by 3.
40.078 g/mol * 3 mol = 120.234 g
Now, let's do the same for Phosphorus.
30.974 g/mol * 2 g/mol = 61.948 g
To find the molar mass of the entire compound, we should add these two values together.
120.234 g + 61.948 g = 182.182 g
Therefore, the correct answer is 182.182 g/mol.
Hope this helps!
I. En un laboratorio se hizo reaccionar una disolución de ácido sulfúrico (H2SO4) con otra de hidróxido de sodio (NaOH), ambos acuosos. Para formar sulfato de sodio (Na2SO4) y 2 moléculas de agua (H2O) líquido. Completa en relación con la ecuación química que representa la reacción:
Answer:
In a laboratory, a solution of sulfuric acid (H2SO4) was reacted with another of sodium hydroxide (NaOH), both aqueous. To form sodium sulfate (Na2SO4) and 2 molecules of liquid water (H2O). Complete in relation to the chemical equation that represents the reaction:
Explanation:
The balanced chemical equation of the reaction is:
[tex]H_2SO_4(aq)+2NaOH(aq)-> Na_2SO_4(aq)+2H_2O(l)[/tex]
Thus, one mole of sulfuric acid reacts with two moles of sodium hydroxide.
What happens to a glass of sugar solution when sugar is added to it?
The number of moles of water increases.
The number of moles of water decreases.
The molarity of the solution increases.
The molarity of the solution decreases.
When sugar is added to a glass of sugar solution, the molarity of the solution increases. Details about molarity can be found below, which is the third option.
What is molarity?Molarity is a term used to identify the amount of solute, in moles, dissolved in a solvent by volume. Molarity is expressed as moles per liter (mol/L).
However, molarity is directly proportional to the amount of solute in solution. This means that as the amount of solute increases, molarity also increases.
Therefore, when sugar is added to a glass of sugar solution, the molarity of the solution increases.
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PLZ HELP Question 2 of 25 What is the total number of atoms in the molecule CzHg?
A. 2
B. 8
C. 11
D. 3
A. 2
One Cs (Caesium), the other one Hg (Mercury)
Note: we don't have Cz this might be Cs
Please help me with my work
Answer:
2
Explanation:
There's 2 Hydrogen and Chlorine molecules on the right side with one Zinc. So the left side needs to have a coefficient of 2 on the hydrochloric acid, or HCl.
what do you mean by 1 joule work
Answer:
Joule is the SI unit of work. 1 Joule is amount of work done when a force of 1 Newton displaces a body through a distance of 1m in the direction of the force applied.
Element X and Y are two different elements that are placed in the same group in the Periodic Table of Elements. Which of the following statements is correct about their atoms?
A Atoms of element X and Y have same number of electrons
B Atoms of element X and Y have different number of protons
C Number of neutrons for atom X and Y changes during formation of an ion
D Nucleon number for atom X and Y is the total number of protons and electrons
Answer:
A Atoms of element X and Y have same number of electrons
- calculate relative formula mass
[N=14, O=16, Mg=24, Al=27]
1) Mg(NO3)2
- calculate relative molecular mass
[H=1, C=12, O=16]
1) C4H10
2) CH3COOH
Mg(NO3)2:-
[tex] \\ \sf \longmapsto \: 24u+2(14u+3\times 16u)[/tex]
[tex] \\ \sf \longmapsto \: 24u+2(14u+48u)[/tex]
[tex]\\ \sf \longmapsto \: 24u+2(62u)[/tex]
[tex] \\ \sf \longmapsto \: 24u+(124u)[/tex]
[tex] \\ \sf \longmapsto \: 148u[/tex]
its not a question but i wanted to tell you guys that if you guyz like my answers then please don't forget to give like and follow at the same time. I am not forcing you to follow only if you guyz like my answer then like or follow. THANKS FOR READING..
Answer:
thank you for this oibnki
Answer:
Sure I'll go ahead and like your answers and follow you if that's what you wanted! :)
Explanation:
the text of oxygen gas in the laboratory
Explanation:in testing for oxygen a glowing splint is used.
the glowing splint is brought in the presence of the test tube containing the gas
the glowing splint rekindles or lights up showing that oxygen is present.
this is a positive test because oxygen supports burning or combustion
How is a slump different from creep?
Answer:
Is this chemistry or ELA!
Plz Help I have One more time To retake and I can't fail it..
Answer:
B. Radar uses radio and the siren uses sound waves. both exhibit in the Doppler effect.
sorry if this is wrong
. De las siguientes soluciones:
1. 20 ml de alcohol etílico mezcladas con 80 ml de agua.
2. 500 ml de agua con 20 g de sal disueltas (V Sln: 500ml).
3. 80 g de sal en 2 litros de agua.
a) Identifica el soluto y solvente de cada solución y explica ¿por qué?
b) Encuentra la concentración por peso de la solución número 3 c) Entre la disolución 2 y 3 ¿Cuál presenta mayor concentración?
por favor lo necesito para hoy ¡gracias!
Answer:
can u translate this to English? I might be able to help
a) Solution 1: Solute is ethyl alcohol, solvent is water. Solution 2 and 3: Solute is salt, solvent is water.
b) Concentration by weight of solution 3: Approximately 3.85%.
c) Solution 3 has a higher concentration than solution 2.
a) Solutions and their solutes and solvents:
Solution 1: The solute is ethyl alcohol, and the solvent is water. This is because ethyl alcohol is the substance that dissolves in water to form the solution.
Solution 2: The solute is salt, and the solvent is water. Salt is the substance that dissolves in water to form the solution.
Solution 3: The solute is salt, and the solvent is water. Similar to solution 2, salt is the substance that dissolves in water to form the solution.
b) Weight concentration of solution number 3:
The weight concentration is calculated by dividing the mass of the solute (80 g of salt) by the total mass of the solution (80 g of salt + 2000 g of water):
Weight concentration = (80 g / 2080 g) * 100% ≈ 3.85%
c) Comparison of concentrations between solution 2 and 3:
Solution number 3 has a higher concentration than solution 2, as the weight concentration of solution 3 is approximately 3.85%, while the exact amount of water is not provided for solution 2 to calculate its concentration. However, solution 2 contains only 20 g of salt dissolved in 500 ml of water, which implies that the concentration will be lower than solution 3. Therefore, solution number 3 has a higher concentration compared to solution 2.
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Suppose that three isotopes of element X occur in nature as follows:
The relative atomic mass of the naturally occurring mixture of element X is
Answer:
107.5 amu
Explanation:
isotopes: fractional Wt Avg
isotopes: isotopic mass %Abundance abundance (amu)
X110 110 60 0.60 66.0
X105 105 30 0.30 31.5
X100 100 10 0.10 10.0
∑ atm mass contributions = 107.5 amu*
*amu = atomic mass units
Describe weighted average
Answer:
Explained below
Explanation:
In simple average, we just add all the given data variables and divide it by the number of data given.
However, when it comes to weighted average, what we do is that we multiply each given variable by their weights and then divide the sum of that by the sum of the weights.
Thus, if the variables are denoted by x and their weights are denoted by y, then we have;
Weighted average = Σ(xy)/Σy
Select the structure corresponding to trans-3-octene.
Answer: B
Explanation:
Answer:
The Correct Answer Is B.
High-pressure liquid chromatography (HPLC) is a method used in chemistry and biochemistry to
purify chemical substances. The pressures used in this procedure range from around 500
kilopascals (500,000 Pa) to about 60,000 kPa (60,000,000 Pa). It is often convenient to know
the pressure in torr. If an HPLC procedure is running at a pressure of 3.20x10^8 Pa , what is its
running pressure in torr?
Express the pressure numerically in torr.
►
3.20 x 10^8 Pa = _____ torr
Answer:
2,400,000 torr (3 s.f.)
Explanation:
Convert the pressure from Pascal to atm first:
[tex]\boxed{1 \: atm = 101325 \:Pa }[/tex]
3.20 ×10⁸ Pa
= [(3.20 ×10⁸) ÷101325] atm
= 3158.2 atm (5 s.f.)
Convert atm to torr:
[tex]\boxed{1 \: atm = 760 \: torr}[/tex]
3158.2 atm
= (3158.2 ×760) torr
= 2400000 torr (3 s.f.)
How many liters of carbon dioxide can be “scrubbed”, or removed, with 3.45 Liters of 0.10 M of lithium hydroxide solution?
Answer:
The correct answer is - 3.864 L of CO2.
Explanation:
can you answer with working out
please help with the attached picture question 21, 22, 23
Explanation:
21. The given molecule for cracking is tetradecane.
On cracking it forms one mole of decane (C10H22) and two moles of ethene gas.
The chemical equation is shown below:
[tex]C_1_4H_3_0->C_1_0H_2_2+2C_2H_4[/tex]
22. The essential condition for the formation of an ester is the reaction of alcohol and acid in presence of concentrated sulfuric acid.
Thus among the given options, the first option is the correct one.
23. Isomers of butanol are shown below:
It is 2-butanol.
The position of -OH group changes to the second carbon.
Which of the following is an example of a solution?
A. An iron alloy
B. Iron metal
C. Iron rust
D. An iron ore
Answer:
A: an iron alloy.
Explanation:
Because iron alloy consists of minor components that are distributed within the major component, which is the basic requirement for a solution.
