The reaction of calcium hydride with water can be used to, Ask an Expert

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The reaction of calcium hydride with water can be used to prepare small quantities of hydrogen gas, as is done to fill weather observation balloons. CaH2 (s) + 2 H2O (l) -----> Ca(OH)2 (s) + 2 H2 (g) (not balanced)
(a) How many grams of H2 (g) result from the reaction of 127 g CaH2 with an excess of water?
(b) How many grams of water are consumed in the reaction of 56.2 g CaH2?

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