During the hydrolysis of 6.4 g of technical calcium carbide, 2 liters of acetylene were formed.

During the hydrolysis of 6.4 g of technical calcium carbide, 2 liters of acetylene were formed. Determine the mass fraction of impurities in calcium carbide.

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

CaC2 + 2H2O = Ca (OH) 2 + C2H2 ↑;

Let’s determine the molar amount of calcium carbide.

To do this, add up the molar weights of the elements that make up this molecule.

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

N CaC2 = 6.4 / 64 = 0.1 mol;

Theoretically, the same amount of acetylene will be synthesized.

Let’s find its volume. For this purpose, we multiply the molar amount of the substance by the volume of 1 mole of the substance (equal to 22.4 liters).

V C2H2 = 0.1 x 22.4 = 2.24 liters;

The mass fraction of silicon carbide is equal to the reaction yield and is 2 / 2.24 = 0.8928 = 89.28%;