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The melting point of a certain substance...

The melting point of a certain substance is `70^(@)C` and its normal boiling point is `450^(@)C`. Its enthalpy of fusion is `30.0cal//g`, enthalpy of vaporisation is `45.0 cal//g` and its heat capacity is `0.215 cal g^(-1)K^(-1)`. Calculate the heat required to convert `100g` of substance from solid state at `70^(@)C` to vapour state at `450^(@)C`.

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