Stoichiometry Chemistry Quiz

1. Which of the following has the largest mass of carbon per gram?

H₂CO₃
CH₃CO₂H
CH₃OH
CH₃CH₂OH

2. Which of the following statements is true?

1 mol H atoms = 6.02 X 10²³ H atoms.
1 mol pennies = 6.02 X 10²³ pennies.
6.02 X 10²³ H atoms have a mass of 1.008 g.
The formula mass of O₂ = 32.00 amu.
All of the above are true.

3. One mole of (NH₄)₂Cr₂O₇ contains:

one mole of nitrogen.
four moles of hydrogen.
one mole of chromium.
seven moles of oxygen.

4. One atom of an element has a mass of 9.123 x 10⁻²³ g. There is only one isotope of the element. The element is:

argon
chlorine
chromium
magnesium
manganese
iron

5. If these fertilizers are priced according to their nitrogen content, which will be the least expensive per 50 lb. bag?

urea (NH₂)₂CO
ammonia NH₃
ammonium nitrate NH₄NO₃
guanidine HNC(NH₂)₂

6. Which of the following has the greatest mass?

200 molecules of water
100 atoms of Fe
200 molecules of O₂
200 molecules of CH₄

7. Balance Ca(OH)₂ (aq) + H₃PO₄ (aq) → H₂O (g) + Ca₃(PO₄)₂ (s):

There is 1 mole of water per mole calcium phosphate.
There are 2 moles of water produced per mole of calcium phosphate.
There are 6 moles of water produced per mole of calcium phosphate.
There are 10 moles of water produced per mole of calcium phosphate.

8. When you balance PH₃ (g) + O₂ (g) → P₄O₁₀ (s) + H₂O (l):

This is 1 mole of water produced per mole of P₄O₁₀.
There are 4 moles of water produced per mole of P₄O₁₀.
There are 6 moles of water produced per mole of P₄O₁₀.
There are 10 moles of water produced per mole of P₄O₁₀.

9. A compound has an empirical formula is NPCl₂ and a molecular weight of 347.66. What is its molecular formula?

NPCl₂
N₂P₂Cl₂
N₂P₃Cl6
You cannot determine the molecular formula from this information.

10. Under which conditions will Mg be the limiting reagent of the reaction Mg (s) + I₂ (s) → MgI₂ (s)?

200 atoms of Mg and 160 molecules of I₂
0.16 mol Mg and 0.25 mol I₂
100 atoms of Mg and 100 molecules of I₂
0.12 mol Mg and 0.08 mol I₂

Stoichiometry Chemistry Quiz

You got: % Correct. You're Starting to Understand Stoichiometry

Good job! You had trouble with the questions, but you made it through the quiz so you've shown you're serious about learning stoichiometry. Stoichiometry is just a 5-syllable word that means mass relations. It sounds intimidating, but it's really not that complicated. It's the study of how much matter reacts with other matter to form compounds and participate in chemical reactions.

To understand stoichiometry, start with this introduction to the topic. It might also help to review molecules and moles, which includes how chemical formulas work.

Ready for another quiz? Here's a quick self-test about the mole. If you'd rather switch gears, see if you know the answers about how chemistry explains the real world.

Stoichiometry Chemistry Quiz

You got: % Correct. You're Mastering Mass Relations

Great work! You've shown you have a good command of mass relations and how the rules used to form chemical compounds and rearrange them in chemical reactions. If you feel a bit shaky about any part of stoichiometry, you can review the basic principles, including the different types of chemical formulas. Moving forward, you'll need to learn how to find theoretical yield and identify the limiting reactant.

Are you ready for another quiz? Put your stoichiometry know-how to use to see whether you can balance these chemical equations. If you'd rather just have some fun, see which chemical element best fits your personality.