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Calcium hydride, CaH2, reacts with water to form hydrogen gas: This reaction is...

Calcium hydride, CaH2, reacts with water to form hydrogen gas:

This reaction is sometimes used to inflate life rafts, weather balloons, and the like, where a simple, compact means of generating H2 is desired. How many grams of CaH2 are needed to generate 53.5 L of H2 gas if the pressure of H2 is 814 torr at 21 °C?

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