Mass of $CaC{O}_3$	Volume of $C{O}_2$ liberated
A) $200{\text{ g of CaCO}}_3$	1) 16.8 lit
B) ${\text{100 g of CaCO}}_3$	2) 11.2 lit
C) $50{\text{ g of CaCO}}_3$	3) 44.8 lit
D) ${\text{75 g of CaCO}}_3$	4) 22.4 lit

The decomposition reaction of ${\text{CaCO}}_{\text{3}}$ is given below.

 ${\text{CaCO}}_3\left(\text{s}\right)\to \text{CaO\hspace{0.17em}(s}){\text{\hspace{0.17em}+\hspace{0.17em}\hspace{0.17em}\hspace{0.17em}CO}}_2\text{(g)}$

${\text{1 mole of CaCO}}_3\to {\text{ 1 mole of CO}}_2$

Molar mass of ${\text{CaCO}}_{\text{3}}$ $\text{=100 g}$

At STP,  $100{\text{\hspace{0.17em}g of CaCO}}_3\to {\text{ 22.4 lit of CO}}_2$

$200{\text{g of CaCO}}_3\to \frac{22.4\text{\hspace{0.17em}L}}{100\text{\hspace{0.17em}g}}\times 200{\text{\hspace{0.17em}g\hspace{0.17em}=\hspace{0.17em}44.8 lit of CO}}_2$

$75{\text{g of CaCO}}_3\to \text{ 22.4\hspace{0.17em}L×}\frac{75\text{\hspace{0.17em}g}}{100\text{\hspace{0.17em}g}}=16.8{\text{ lit of CO}}_{\text{2}}$

$50{\text{g of CaCO}}_3\to \frac{22.4}{100\text{\hspace{0.17em}g}}\times 50\text{g}=11.2{\text{ lit of CO}}_2$