What mass of technical calcium carbide, containing 20% impurities, will be required to obtain 2.8 liters of acetylene?

The reaction for the synthesis of acetylene from calcium carbide is described by the following chemical reaction equation:

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

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

Let’s calculate the available chemical amount of the acetylene substance.

1 mole of ideal gas fills a volume of 22.4 liters under normal conditions.

N C2H2 = 2.8 / 22.4 = 0.125 mol;

For this reaction, you need to take 0.125 mol of silicon carbide.

Let’s calculate its weight taking into account the content of 20% impurities.

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

m CaC2 = 0.125 / 0.8 x 64 = 9.98 grams;