Quiz/test – Stoichiometry



Test – Stoichiometry Name____________________________

1. Joey Shmoe, a devious student, stole 66.6 grams of magnesium from the chem lab to watch people writhe in pain from retina damage as he burns it.

a) How much of the product should he get?

b) What kind of yeild is this?

c) A very sloppy student, Joey only got 33.3 grams of the product. What was the % yield?

2. What mass of sodium hydroxide is needed to completely react with 34.5 grams of nitric acid?

3. What mass of hydrogen would you get if you reacted 45.0 grams of zinc with hydrochloric acid? How many moles is this?

4. The world is slowly running out of water because the aliens from planet zurg keep swiping it from us. In order to save the world, you rely on your vast chemistry knowledge to make water by decomposing some calcium hydroxide, a common chemical used in homes as lime on their lawns. In order for the average person to consume 4 liters of water per day [4000 grams], how much calcium hydroxide will you need to decompose per person?

5. Andy, the little pyromaniac, decides not drink his water, but to decompose his 4000 grams of water in order to make hydrogen, so he can light it on fire. What mass of hydrogen should he get from the 4000 grams?

6. A student reacts 5.00 grams of silver with nitric acid and get exactly 5.00 grams of silver nitrate. He proudly states “I got 100% yield”. Is he correct? If not, show work to prove that he isn’t. [You have to show work, anyway, right?]

7. How much ammonia (NH3) could you get by reacting 2.55 grams of hydrogen with nitrogen?

8. Ammonium nitrate fertilizer is produced by reacting ammonia (see problem 1) with nitric acid. How much ammonium nitrate should you get by reacting 50.0 grams of ammonia? If you got 55.0 grams of ammonium nitrate by doing this reaction in the lab, what would be your percent yield?

9. What mass of silver nitrate is needed to fully react with 10.0 grams of calcium chloride?

10. In the lab, you make sodium chloride. You were supposed to get 75.0 grams of it, but only got 25.0 grams of it. What is the theoretical yield? The actual yield? The percent yield?

11. You burn 15.0 grams of propane (C3H8) and get 10.0 grams of water. What is the theoretical yield of water? The actual yield of water? The percent yield of water?

12. In problem #11, what mass of oxygen is needed to fully react with the propane?

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