1.

Calulate the weight of lime `(CaO)` obtained by heating `300 kg` of `90%` pure limestone `(CaCO_(3))`.

Answer» `100 kg` impure sample has pure `CaCO_(3)= 90 kg`
`:. 300 kg` impure sample has pure `CaCO_(3)`
`=(90xx300)/(100)= 270 kg`
`CaCO_(3)rarrCaO+CO_(2)`
`:. 100 kg CaCO_(3)` gives `CaO= 56 kg`
`:. 270 kg CaCO_(3)` gives `CaO=(56xx270)/(100)= 151.120 kg`


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