Calcium hydride, CaH2 , reacts with water to form hydrogen gas: CaH2( s )+2H2O(

Question

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.

Part A

How many grams of CaH2 are needed to generate 147 L of H2 gas if the pressure of H2 is 824 torr at 22 C ?

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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 147 L of H2 gas if the pressure of H2 is 824 torr at 22 C ?

SubmitHintsMy AnswersGive UpReview Part

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.

Part A

How many grams of CaH2 are needed to generate 147 L of H2 gas if the pressure of H2 is 824 torr at 22 C ?

SubmitHintsMy AnswersGive UpReview Part

m = g v

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 147 L of H2 gas if the pressure of H2 is 824 torr at 22 C ?

SubmitHintsMy AnswersGive UpReview Part

m = g

Explanation / Answer

Since, we know that, PV = nRT
nH2 = PV/(RT) = (824torr x 1atm/760torr) x (147L) / (0.08206 Latm/molK x 295K)
nH2 = 6.54077 mol

then..
6.54077 mol H2 x (42.09g CaH2 / mol CaH2)x(1 mol CaH2 / 2 mol H2) = 137.6505g CaH2 (Answer)

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