Calculate the weight of lime (CaO) obtained by heating 200 kg of 95% pure lime stone `(CaCO_3)`.

Options

A. `104.4 kg`
B. `105.4 kg`
C. `212.8 kg`
D. `106.4 kg`

Answer

D

Explanation

`:. 100 kg` impure sample has pure `CaCO_(3)=95 kg`
`:. 200 kg` impure sample has pure `CaCO_(3)=(95xx200)/(100)=190 kg`
`CaCO_(3) to CaO+CO_(2)" ":." " 100 kg CaCO_(3)" gives "56 kg CaO`
`190 kg CaCO_(3)` gives `CaO=(56xx190)/(100)=106.4 kg`