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) + H2O(l) → Ca(OH)2(s) + H2(g) (not balanced)

(a) How many grams of H2(g) result from the reaction of 134 g CaH2 with an excess of water?

(b) How many grams of water are consumed in the reaction of 58.3 g CaH2?

(c) What mass of CaH2(s), in g, must react with an excess of water to produce 4.15 x 1024 molecules of H2?