# When decomposing limestone with a mass of 1 ton, we obtain carbon dioxide V = 201.6.

When decomposing limestone with a mass of 1 ton, we obtain carbon dioxide V = 201.6. what is the mass fraction of calcium carbonate in this limestone?

The decomposition reaction of calcium carbonate when heated is described by the following chemical equation:

CaCO3 = CaO + CO2 ↑;

Let’s calculate the chemical amount of carbon dioxide. To do this, we divide its volume by the volume of 1 mole of the substance.

N CO2 = 201,600 / 22.4 = 9,000 mol;

The same molar amount of calcium carbonate was decomposed.

Let’s calculate its weight:

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

m CaCO3 = 100 x 9000 = 900 kg;

Mass fraction of calcium carbonate is:

K = 900/1000 = 0.9 = 90%;

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