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The mass of a copper steam boiler is 200...

The mass of a copper steam boiler is 200 kg. It contains 100 kg of water at `25^(@)C.7xx10^(6)` cal of heat is produced by burning 1 kg of coal and only `3%` of it is absorbed by the boiler to heat water. How much coal is to be burnt to raise the temperature of the water in the boiler to its boiling point? Specific heat of copper `="0.09 cal.g"^(-1).^(@)C^(-1)`.

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42.12 kg
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