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Sourav posted an Question
September 02, 2020 • 06:34 am 30 points
  • IIT JAM
  • Chemistry (CY)

Im not getting answer.. plz help

2 Answer(s) Answer Now
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    Abhishek kumar singh Best Answer

    If heat capacity of calorimeter is 'C' , and ∆T is change in temperature produced by burning a substance of mass 'm' whose molar mass is M. Then enthalpy of combustion or molar internal energy of combustion is given by q = C×∆T×M/m q= 2.5 kJ/K × 4K × (50g/mol)/0.5g q= 1000 kJ/mol since enthalpy of combustion has always negative sign therefore q= - 1000 kJ/mol option B is correct

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    but sir.. it is told to answr in KJ.. plz check.

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    There is mistake in question, clearly it is asking for molar internal energy of combustion which is an extensive property so how it could be only kJ I am sending you picture taken from Book "Principle of physical chemistry" Puri, Sharma and Pathania

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    If you are satisfied please mark as best answer.

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