How much calcium carbonate was decomposed if 2.8 calcium oxide was released as a result of the reaction?

The thermal decomposition reaction of calcium carbonate upon heating is described by the following chemical reaction equation:

CaCO3 = CaO + CO2 ↑;

Let’s find the amount of calcium oxide. To do this, we divide its mass by the weight of 1 mole of the substance.

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

N CaO = 2.8 / 56 = 0.05 mol;

The same amount of limestone must be decomposed.

Let’s calculate its weight:

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

m CaCO3 = 0.05 x 100 = 5 grams;