Question

The mass of $CaO$ obtained by the decompostion of 2 moles of $CaC{O}_3$ is:
Molar mass of calcium carbonate = 100 g/mol
Molar mass of calcium oxide = 56 g/mol

• A. 100 g
• B. 112 g
• C. 106 g
• D. 56 g

Answer 1

The correct option is B 112 g

$CaC{O}_3\to CaO+C{O}_2$
Moles of calcium carbonate= $\frac{200}{100}=2$
1 mole of calcium oxide can be obtained from 1 mole of calcium carbonate.
Hence, 2 moles of $CaO$ is formed.
Mass of calcium oxide = $2\times 56=112g$