Question

The mass of CaO that shall be obtained by heating 20 kg of 90% pure limestone $(CaCO_3)$ is

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

Answer 1

Answer: (C)

10.08 kg

Answer 2

$CaCo_{3} \to Cao+Co_{2}$ Pure lime in $20 \,kg = \frac{20 \times90}{100}=18\,kg$ $CaO$ produced $=\frac{56\times18}{100}$ $=10.08\,kg$