Question

A sample of limestone having moss of 150 Kg which is 75% pure. Find the mass of calcium oxide if the sample is heated till decomposition.

Answer 1

Answer is: 63

\(\underset{150\ kg}{CaCO_3} \rightarrow CaO + CO_2\)

\(\text{Pure} \ CaCO_3 \text{ is 150 kg} \ \times \ \frac{75}{100}\)

\(= 150 \times 10^3 \times \frac{75}{100} = 1125 \times 10^2 gm\)

\(\text{Mole of } CaCO_3 = \frac{1125 \times 10^2}{100} = 1125 \text{mole}\)

\(\text{Mole of CaO} = 1125 \ mole\)

\(\text{Mass of CaO}= 1125 \times 6\)

\(=63000 \ gm\)

\(= 63 \ kg\)