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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Chemistry (CY)
Im not getting answer.. plz help
2 Answer(s)
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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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Dinesh khalmaniya 1![best-answer]()
option B
here unit will be in KJ/mol