Calculate the mass of acetylene obtained from 61.54 g of calcium carbide CaC2 with water containing 20% impurities.

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 = 61.54 x 0.8 / 64 = 0.769 mol;

Let’s calculate the weight of the same amount of acetylene.

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

M C2H2 = 12 x 2 + 2 = 26 grams / mol; m C2H2 = 26 x 0.769 = 19.994 grams;