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A vessel made of copper weighs 1 kg and ...

A vessel made of copper weighs 1 kg and it contains 1 kg of water at `10^(@)C`. How much coal will be required to raise the temperature of this water to `100^(@)C`? On burning 1 kg of coal, `10^(4)` cal of heat can be produced and `40%` of this heat is lost. Specific heat of copper `="0.09 cal.g"^(-1).^(@)C^(-1)`.

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16.35 kg
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