How many number of moles of CO₂ are produced when 3 moles of HCl react with excess of CaCO₃ ?

The number of moles of CO₂ produced when 3 moles of HCl react with excess of CaCO₃ is,

$$\begin{gathered} {\mathrm{CaCO}}_3+2\mathrm{HCl}\to {\mathrm{CaCl}}_2+{\mathrm{CO}}_2+{\mathrm{H}}_2\mathrm{O} \\ 2\mathrm{moles} 1\mathrm{mol}. \\ 3 ? \end{gathered}$$

The number of moles of CO₂ produced =$\frac{3}{2}=1.5 \mathrm{moles}$

Hence, 1.5 moles of CO₂ are produced when 3 moles of HCl react with excess of CaCO₃.