By firing 260 kg of limestone, 112 kg of calcium oxide were obtained. Calculate the mass and mass fraction

By firing 260 kg of limestone, 112 kg of calcium oxide were obtained. Calculate the mass and mass fraction of calcium carbonate in limestone.

The decomposition reaction of limestone is described by the following chemical reaction equation:

CaCO3 = CaO + CO2;

When 1 mol of limestone is decomposed, 1 mol of gaseous carbon dioxide is synthesized.

This also synthesizes 1 mol of calcium oxide

Let’s calculate the available chemical amount of the calcium oxide substance.

M CaO = 40 + 16 = 56 grams / mol;

N CaO = 112,000 / 56 = 2,000 mol;

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

M CaCO3 = 40 + 12 + 16 x 3 = 100 grams / mol;

m CaCO3 = 2,000 x 100 = 200,000 grams;

Let’s calculate the mass fraction of impurities.

K lime = m lime / m sample = 200/260 = 0.769 = 76.9%;