Find the number of grams from this...

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Calcium hydride reacts with water to form calcium hydroxide and hydrogen gas.

(a) Write a balanced chemical equation for the reaction. (Use the lowest possible coefficients. Include states-of-matter under SATP conditions in your answer.)

(b) How many grams of calcium hydride are needed to form 6.491 g of hydrogen?

Jul 24th, 2015

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a) CaH2(s)+2H2O(l)----Ca(OH)2(s)+2H2(g)

b) Moles of hydrogen gas = 6.491 g/(2*1.008 g/mole H2) = 3.220 moles H2 
Moles of CaH2 = (3.220 moles H2) x (1 mole CaH2/2 moles H2) = 1.61 moles CaH2 
Grams Calcium hydride = 1.61 moles x 42.094 g/mol = 67.77 grams 

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Jul 24th, 2015

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Jul 24th, 2015

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Jul 24th, 2015

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