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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?
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a]CaH2 [s] +H2O[l] = Ca [OH] 2 [s] +2H2 [g]
b]2 moles of hydrogen is formed for every one mole of calcium hydride
40+2 = 42 GRAMMES
Thus 4g= Hydrogen
42 /[ 6.491 /4]
42/ 1. 3
32 grammes
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