# What volume of gas will be released under the action of water on 20 g of technical calcium

What volume of gas will be released under the action of water on 20 g of technical calcium carbide containing 4% of impurities?

Acetylene is synthesized by the interaction of calcium carbide with water.

CaC2 + 2H2O = Ca (OH) 2 + C2H2 ↑;

Let’s calculate the molar amount of calcium carbide.

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

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

N CaC2 = 20 x 0.96 / 64 = 0.3 mol;

Theoretically, the same molar amount of acetylene will be synthesized.

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

V C2H2 = 0.3 x 22.4 = 6.72 liters;

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