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Evolved Gas

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Lithium metal reacts with water to yield hydrogen gas. A piece of lithium weighing 10.63 grams was added to 27.57 grams of water. When finished, the solution - containing lithium hydroxide - weighed 34.85 grams. How many grams of hydrogen gas was evolved?

a. 3.35 grams
b. 21.2 grams
c. 1.53 grams
d. 1.05 grams
e. 4.766 grams

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Following the law of conservation of mass, the total mass of ...

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