Question

Find out the loss in weight when 75 g of calcium carbonate is subjected to decomposition completely.

• A. 66 g
• B. 22 g
• C. 44 g
• D. 33 g

Answer 1

The correct option is D 33 g

The chemical equation for the decomposition of $CaC{O}_3$ can be written as:
$CaC{O}_3\to CaO+C{O}_2$
100 g of $CaC{O}_3$ burns completely to produce 56 g of $CaO$.
75 g of $CaC{O}_3$ burns completely to produce = $\frac{56}{100}\times 75$ $=42$ g of $CaO$.
Therefore, loss of weight of $CaC{O}_3$ $=75-42=33$ g