1.     255 grams of hexane (C₇H₁₆) is combusted (burning reaction) to form carbon dioxide and water. What is the mass (in grams) of the carbon dioxide formed?

2.     375 grams of potassium hydroxide and some hydrogen gas was formed in a reaction between water and potassium. How many grams of water reacted with the potassium?

3.     77.4 grams of calcium reacted with hydrochloric acid to produce hydrogen and calcium chloride. What is the mass of the hydrochloric acid that reacted?

4.     0.0424 moles of hydrogen reacted with nitrogen. Find the mass of ammonia produced.

5. Nitrogen gas plus hydrogen reacts. If 8.0 grams of hydrogen gas reacts with an excess (plenty of) nitrogen gas, how many grams of ammonia are made?

6.     10 grams of sodium reacts with an excess of nitrogen gas. How many grams of sodium nitride are formed?

7.     25 grams of silver (I) oxide decomposes to form oxygen and silver. How many grams of oxygen are formed?

8.     Sodium hydroxide reacts with sulfuric acid to produce water and sodium sulfate.

• If 250 grams of water are produced, calculate how many moles of sodium hydroxide reacted.
• If 250 grams of water are produced, calculate how many moles of sulfuric acid reacted.
• If 250 grams of water are produced, calculate how many grams of sodium sulfate is produced.

9.     45.6 grams of hydrogen gas and an excess of oxygen molecules were allowed to react to produce water. Find the mass in grams of the product formed.

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