Calcium hydride reacts with water to form calcium hydroxide and hydrogen gas.
(b) How many grams of calcium hydride are needed to form 6.491 g of hydrogen?
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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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