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Nivedha posted an Question
September 11, 2020 • 03:02 am 30 points
  • CSIR NET
  • Chemical Sciences

In a bomb calorimeter, the combustion of0.5 gofcompound a (molar mass= 50 g mof) increased the temperature by 4 k. ifthe heat capacity ofthe calorinmeter along

In a bomb calorimeter, the combustion of0.5 gofcompound A (molar mass= 50 g moF) increased the temperature by 4 K. Ifthe heat capacity ofthe calorinmeter along with that of the material is 2.5 k K', what is the molar internal energy of combustion, in kJ (a) 1000 (b)-1000 (c) 20 (d)-20

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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 Here answer in option is given only in kJ but it should be kJ/ mol as molar internal energy or enthalpy of combustion is extensive property

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