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21-09-2016
Chemistry

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Equation: CaH2 + 2H2O ---> Ca(OH)2 + 2H2. . How many grams of calcium hydride are needed to form 4.500 g of hydrogen?

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23-09-2016

The balanced chemical reaction is written as:

CaH2 + 2H2O ---> Ca(OH)2 + 2H2

We are given the hydrogen gas produced from the reaction. We use this amount as the starting point for the calculations.

4.5 g H2 ( 1 mol / 2.02 g) (1 mol CaH2 / 2 mol H2) ( 42.094 g / 1 mol ) = 46.87 g CaH2

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