# Calcium carbide 80 grams, mass fraction of impurities 10% and product yield 80%. Find the volume of C2H2?

Acetylene is released when calcium carbide interacts with water.

CaC2 + 2H2O = Ca (OH) 2 + C2H2 ↑;

Let’s determine the chemical amount of calcium carbide.

For this purpose, we add up the molar weights of the elements that make up its molecule.

M CaC2 = 40 + 12 x 2 = 64 grams / mol;

N CaC2 = 80 x 0.9 / 64 = 1.125 mol;

Taking into account the reaction yield of 80%, 1.125 x 0.8 = 0.9 mol of acetylene will be synthesized.

Let’s find its volume. To do this, multiply the molar amount of the substance by the volume of 1 mole of the substance (which is 22.4 liters).

V C2H2 = 0.9 x 22.4 = 20.16 liters;

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