Reactions of acids

A student adds excess dilute hydrochloric acid to 2.0 g of calcium carbonate, CaCO$_3$. Carbon dioxide gas is produced.

The relative molecular mass of CaCO$_3$ is 100.

How many moles of carbon dioxide are formed?
$\text{CaCO}_3 + 2\text{HCl} \rightarrow \text{CaCl}_2 + \text{H}_2\text{O} + \text{CO}_2$