ChemistryStoichiometry
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Mole Concept in Chemistry Quiz

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#1

1. What is the Avogadro's number?

6.022 x 10^23
Explanation

Number of atoms or molecules per mole

#2

2. How many moles of atoms are present in one mole of methane (CH4)?

4
Explanation

Number of atoms present in the compound

#3

8. What is the relationship between the mole and Avogadro's number?

1 mole = Avogadro's number
Explanation

Numerical relationship between a mole and Avogadro's number

#4

15. What is the molar volume of an ideal gas at standard temperature and pressure (STP)?

22.4 L/mol
Explanation

Volume occupied by one mole of an ideal gas

#5

17. What is the relationship between the mass, moles, and molar mass of a substance?

Moles = Mass / Molar mass
Explanation

Relationship between mass, moles, and molar mass

#6

3. What is the molar mass of water (H2O)?

18 g/mol
Explanation

Mass of one mole of the substance

#7

4. If 2 moles of a substance weigh 36 grams, what is its molar mass?

20 g/mol
Explanation

Mass of one mole of the substance

#8

6. How many moles of oxygen (O2) molecules are there in 2 moles of ozone (O3)?

4 moles
Explanation

Number of molecules of the specified compound

#9

9. In a chemical reaction, if the reactants are in stoichiometric proportions, what is the relationship between their mole ratios?

Equal
Explanation

Mole ratio of reactants and products in a balanced equation

#10

11. If 18 grams of water (H2O) is present, how many moles of water molecules are there?

2 moles
Explanation

Quantity of molecules based on the given mass

#11

5. What is the concept of the limiting reactant in a chemical reaction?

The reactant that is completely consumed
Explanation

Reactant that determines the maximum amount of product

#12

7. If the empirical formula of a compound is CH2 and its molar mass is 42 g/mol, what is its molecular formula?

C2H4
Explanation

Actual formula considering the compound's molar mass

#13

10. What is the molarity of a solution containing 0.5 moles of solute in 250 mL of solution?

1.0 M
Explanation

Concentration of solute in a solution

#14

12. What is the formula for percent composition?

(Mass of element / Molar mass of compound) x 100
Explanation

Percentage of an element's mass in a compound

#15

14. Which gas law is represented by the equation PV = nRT?

Ideal Gas Law
Explanation

Relationship between pressure, volume, temperature, and quantity of gas

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