A limestone sample (CaCO3) was dissolved in nitric acid weighing 100 g with

A limestone sample (CaCO3) was dissolved in nitric acid weighing 100 g with a mass fraction of acid of 12%. Find the volume emitted carbon dioxide.

When calcium carbonate reacts with nitric acid, calcium nitrate is synthesized, water and carbon dioxide gas is released. The reaction is described by the following equation:

CaCO3 + 2HNO3 = Ca (NO3) 2 + CO2 ↑ + H2O;

Let’s calculate the chemical amount of nitric acid. To do this, we divide its weight by its molar mass.

M HNO3 = 1 + 14 + 16 x 3 = 63 grams / mol; N HNO3 = 100 x 0.12 / 63 = 0.19 mol;

With this amount of acid, 0.19 / 2 = 0.095 mol of limestone can be dissolved and the same amount of carbon dioxide can be obtained.

Let’s find its volume. To this end, we multiply the amount of substance by the volume of 1 mole of gas (which is 22.4 liters).

V CO2 = 0.095 x 22.4 = 2.133 liters;