Calcium carbonate decomposes on heating according to the following equation

${\mathrm{CaCO}}_{3\left(\mathrm{s}\right)}\iff {\mathrm{CaO}}_{\left(\mathrm{s}\right)}+{\mathrm{CO}}_{2\left(\mathrm{g}\right)}$

The number of moles of ${\mathrm{CO}}_2$ obtained by the decomposition of $50\mathrm{g} {\mathrm{CaCO}}_3$ is