Question

10.0 g of $CaC{O}_3$ on heating gave 4.4 g of $C{O}_2$ and x g of $CaO$. Applying the law of conservation of mass, calculate the mass of $CaO$.

• A. 6.5 g
• B. 5.6 g
• C. 4.2 g
• D. 5.3 g

Answer 1

The correct option is B 5.6 g

According to the law of conservation of mass,
mass of reactants = mass of products
$CaC{O}_3\to CaO+C{O}_2$
10 g x g 4.4 g

Hence x = 10 - 4.4 = 5.6 g