Technical calcium carbide weighing 120 kg was treated with water

Technical calcium carbide weighing 120 kg was treated with water, and a gas with a volume of 33.6 m3 was formed. Determine the mass fraction of pure 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.

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 = 120,000/64 = 1,875 mol;

Theoretically, the same amount of acetylene will be synthesized.

Let’s find 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 = 1875 x 22.4 = 42,000 liters;

The mass fraction of silicon carbide is equal to the reaction yield and is 33,600 / 42,000 = 0.8 = 80%;