The mole

A student adds excess dilute hydrochloric acid to 2.0 g of magnesium carbonate until no more gas is produced. The equation is:

$MgCO_3 + 2HCl \rightarrow MgCl_2 + CO_2 + H_2O$.

What mass of carbon dioxide is formed? ($M_r$: $MgCO_3 = 84$, $CO_2 = 44$)