### Define this reaction is sometimes used to inflate life rafts

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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 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 143L of H2 gas if the pressure of H2 is 823torr at 21deg C?

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