How many grams of water are needed

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Calcium carbide, CaC2, reacts with water to form acetylene. CaC2(s) + 2 H2O(l) -> C2H2(g) + Ca(OH)2(s)
(a) How many grams of water are needed to react with 473 g of calcium carbide?
(b) How many grams of CaC2 could make 21.8 g C2H2?
(c) If 51.3 g Ca(OH)2 are formed, how many grams of water reacted?

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