How much lime(CaO) can be obtained by heating 200 kg of limestone which is 95% pure?

Mass of pure lime stone $=\frac{95}{100}\times 200=190\mathrm{kg}{\mathrm{CaCO}}_3\to \mathrm{CaO}+{\mathrm{CO}}_{2}100\mathrm{kg}$
56kg Amount of CaO obtained $=\frac{56}{100}\times 190=106.4\mathrm{kg}$