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One tonne of water is heated from 10^(@)...

One tonne of water is heated from `10^(@)C" to "70^(@)C` using coal. The heat of combustion of coal is `1.5xx10^(4)" cal.g"^(-1)`. How many kilograms of coal is required if `60%` of the heat is utilised in heating water ?

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667 kg
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