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Q.

At 250°C and pressure, the enthalpies of combustion are given below H2(−286 KJ/mole), Carbon (−394 KJ/mole) and ethane (−1560  KJ/mole) respectively. Then the enthalpy of formation of ethane is

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a

+54  KJ/mole

b

−54  KJ/mole

c

−86  KJ/mole

d

+86  KJ/mole

answer is C.

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At 250°C and pressure, the enthalpies of combustion are given below H2(−286 KJ/mole), Carbon (−394 KJ/mole) and ethane (−1560  KJ/mole) respectively. Then the enthalpy of formation of ethane is