The equation for the reaction of calcium carbide with water:
CaC2 + 2H2O = Ca (OH) 2 + C2H2
The amount of acetylene substance:
v (C2H2) = V (C2H2) / Vm = 56 / 22.4 = 2.5 (mol).
According to the reaction equation, 1 mol of C2H2 is formed from 1 mol of CaC2, therefore:
v (CaC2) = v (C2H2) = 2.5 (mol).
Thus, the mass of calcium carbide required is:
m (CaC2) = v (CaC2) * M (CaC2) = 2.5 * 64 = 160 (g).
Answer: 160 g.
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