What mass of calcium carbide contains 25% of impurities do you need to take to get 39g of acetylene?

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

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

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

Find the available chemical amount of aceylene.

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

N C2H2 = 39/26 = 1.50 mol;

The same amount of calcium carbide will be used. Taking into account the impurity content of 25%, its weight will be:

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

m CaC2 = 1.5 x 64 = 96 grams;