When heated, calcium carbonate decomposes into calcium oxide and carbon dioxide.

When heated, calcium carbonate decomposes into calcium oxide and carbon dioxide. Calculate how much limestone containing 90% by mass of calcium carbonate is required to obtain 7 tons of calcium oxide.

The limestone roasting reaction is described by the following equation:

CaCO3 = CaO + CO2 ↑;

The decomposition of 1 mol of limestone synthesizes 1 mol of calcium oxide and 1 mol of carbon monoxide.

Find the chemical amount of calcium oxide. To do this, divide its weight by its molar weight.

M CaO = 40 + 16 = 56 grams / mol; N CaO = 7,000,000 / 56 = 125,000 mol;

Let us determine the mass of 125,000 mol of calcium carbonate.

M CaCO3 = 40 + 12 + 16 x 3 = 100 grams / mol; m CaCO3 = 125,000 x 100 = 12.5 tons;

The weight of the limestone will be: 12.5 / 0.8 = 15.625 kg;