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Calcium hydride reacts with water to form hydrogen gas and calcium hydroxide. How many grams of calcium hydride are needed to generate 53.5 liters of hydrogen gas if the pressure is 814 torr at 21*C.

Cynthia Baker

in Chemistry

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Blair Lewis on January 18, 2018

The Equation is cah2(s)+2H2O(l)-->Ca(OH)2(aq)+2H2(g) therefore,the moles of H2 generated = PV / RT R = 62.363 L Torr K−1 mol−1 number of moles = 814 * 53.5 / 62.363 * 293 = 2.38 moles looking at the equation these were 2.38 /2 moles of Cah 2 or 1.19 mol Molar mass of cah2 is 42.0943 g/mol, so that the mass of the Cah 2 = 1.19 X 42.1 = 50.01 g


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