Question

The mass of CaO that shall be obtained by heating 20 kg of 90% pure limestone $(CaC{O}_3)$ is

• A. 11.2 kg
• B. 8.4 kg
• C. 10.08 kg
• D. 16.8 kg

Answer 1

Answer: (C)

$CaC{o}_3\to Cao+C{o}_2$
Pure lime in $20kg=\frac{20\times 90}{100}=18kg$
$CaO$ produced $=\frac{56\times 18}{100}$
$=10.08kg$