Question

Calculate the mass of $C{O}_2$ produced by heating $20\text{g}$ of pure limestone $\left(CaC{O}_3\right)$.

• A. 20 g
• B. 10 g
• C. 8.8 g
• D. 5.5 g

Answer 1

The correct option is C 8.8 g

$CaC{O}_3\to CaO+C{O}_2$
Given mass of pure $CaC{O}_3=20\text{g}$
$100\text{g}$ of $CaC{O}_3$ produce $44\text{g}$ of $C{O}_2$
So, $20\text{g}$ of $CaC{O}_3$ will produce $(\frac{44}{100}\times 20)=8.8\text{g}$ of $C{O}_2$