# When calcium carbide was dissolved in water, 11.2 liters of gas were released. The mass of calcium carbide is …

January 13, 2021 | education

| Acetylene is synthesized by the interaction of calcium carbide with water.

CaC2 + 2H2O = Ca (OH) 2 + C2H2 ↑;

Let’s calculate the molar amount of acetylene.

To do this, we divide its volume by the volume of 1 mole of gas under normal conditions (it is 22.4 liters).

N C2H2 = 11.2 / 22.4 = 0.5 mol;

To get this amount of acetylene, you need to take the same amount of calcium carbide. Let’s calculate its weight.

For this purpose, we multiply the molar amount of the substance by the weight of 1 mole of the substance, which is equal to the sum of the molar weights of the elements constituting this molecule.

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

The weight of pure silicon carbide will be:

m CaC2 = 0.5 x 64 = 32 grams;

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