Calculate the mass of benzene that can be obtained using 400g of technical calcium carbide containing 4% 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.

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 = 400 x 0.96 / 64 = 6 mol;

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

From this amount of acetylene, 3 times less benzene can be synthesized.

Let’s calculate its weight:

M C6H6 = 12 x 6 + 6 = 78 grams / mol;

m C6H6 = 6/3 x 78 = 156 grams;