Technical calcium carbide contains 20% impurity. How many liters of acetylene are formed from 500 g of this carbide?

When calcium carbide interacts with water, acetylene and calcium hydroxide are synthesized. The reaction is described by the following equation.

CaC2 + 2H2O = Ca (OH) 2 + C2H2;

From 1 mole of calcium carbide, 1 mole of acetylene is synthesized.

Let’s calculate the available amount of calcium carbide substance.

To do this, we divide the mass of the substance by its molar weight.

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

N CaC2 = 500 x 0.8 / 64 = 6.25 mol;

Let’s calculate the volume of 6.25 mol of acetylene.

To do this, multiply the amount of substance by the volume of 1 mole, which is 22.4 liters.

V C2H2 = 6.25 x 22.4 = 140 liters;