Stoichiometry Test Review

If the amount of a substance that you have is less than the amount you need, your reactant is ______.

• Limiting

• Excess

• Stoichiometry

• Available

1. In a reaction I theoretically expect to obtain 42.65 grams of product. After the experiment you actually end up with 35.95 grams of the product. What is your percent yield?

• 109%

• 84.3%

• 91.3%

• 81.7%

2. How many grams of oxygen would be required for the combustion of 50 grams of methane  (CH₄)?

• 49.87 grams

• 99.73 grams

• 399.0 grams

• 199.5 grams

3. The decomposition of nitrogen triiodide produced 274 grams of Iodine gas (excess nitrogen gas is the other product). How much nitrogen triiodide did you start with?

• 851 grams

• 568 grams

• 378 grams

• 284 grams

4. The SYNTHESIS of 1000 grams of ammonia (NH₃), would require how much nitrogen gas? (requires hydrogen gas as other reactant)

• 89 grams

• 411 grams

• 1,644 grams

• 822 grams

5. If I have 25 grams of Iron (III) chloride and 25 grams of copper metal, what would be my limiting reagent? (The product will have a copper (II) ion)

• Iron Metal

• Iron (III) chloride

• Copper metal

• Copper (II) chloride

6. Determine the amount of Aluminum hydroxide product produced if you mix 75 grams of Aluminum (III) chloride with 40 grams of Lithium hydroxide.

• 214.9 grams

• 23.9 grams

• 43.4 grams

• 21.6 grams

7. A solution is made by dissolving 0.40 mole of NaCl in enough water to give a final volume of 250.0 mL. What is the molarity of the solution?

• 0.10 M

• 0.80 M

• 1.6 M

• 2.5 M

8. What is the molarity of a solution containing 181.4 grams of NH₃ in 0.75 liters of solution?

• 0.0833 M

• 0.833 M

• 1.42 M

• 14.2 M

9. 186 mL of a 0.20 M HBr solution requires what volume of concentrated 6M HBr?

• 5.3 mL

• 5.8 mL

• 7.1 mL

• 6.2 mL