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Calcium hydride, CaH2, reacts with water to form hydrogen gas: CaH2(s)+2H2O(l)→Ca(OH)2(aq)+2H2(g) This reaction is sometimes used...

Calcium hydride, CaH2, reacts with water to form hydrogen gas:
CaH2(s)+2H2O(l)→Ca(OH)2(aq)+2H2(g)
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 146 L of H2 gas if the pressure of H2 is 823 torr at 22 ∘C?

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