Ionic metal hydrides react with water to give hydrogen gas and an aqueous soluti

Question

Ionic metal hydrides react with water to give hydrogen gas and an aqueous solution of the metal hydroxide.

Part A

Upon the reaction of equal masses of LiH and CaH2 with water, which compound gives more hydrogen?

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Correct

Part B

How many kilograms of CaH2 are needed to fill a 116L tank with compressed H2 gas at 124atm pressure and 28?C?

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Ionic metal hydrides react with water to give hydrogen gas and an aqueous solution of the metal hydroxide.

Part A

Upon the reaction of equal masses of LiH and CaH2 with water, which compound gives more hydrogen?

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Correct

Part B

How many kilograms of CaH2 are needed to fill a 116L tank with compressed H2 gas at 124atm pressure and 28?C?

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Explanation / Answer

A) LiH will give more H2 gS

2) Applying PV = n*R*T; we get n = (P*V)/(R*T) = (124*116)/(0.0821*301) = 582.06 moles

Now, CaH2 + H2O ---------> CaO + 2H2(g)

moles of H2 produced = 582.06

thus, moles of CaH2 required = (1/2)*582.06 = 291.03

molar mass of CaH2 = 42 g/mole

Thus, mass of CaH2 required = 291.03*42 = 12223.32 g = 12.223 kg

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