# What volume of acetylene can be obtained from technical calcium carbide weighing 65 g

**What volume of acetylene can be obtained from technical calcium carbide weighing 65 g, if the mass fraction of impurities in it is 20%?**

The reaction for producing acetylene from calcium carbide occurs in accordance with the following chemical reaction equation:

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

The decomposition of 1 mol of calcium carbide releases 1 mol of gaseous acetylene.

The mass of pure calcium carbide is 65 x 0.8 = 52 grams.

Let’s find the amount of a substance contained in 52 grams of calcium carbide.

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

N CaC2 = 52/64 = 0.8 mol;

When this reaction is carried out, 0.8 mol of acetylene will be released.

Let’s calculate its volume.

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

The amount of acetylene will be equal to:

V C2H2 = 0.8x 22.4 = 17.92 liters;