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75. The enthalpy of formation for C2H4g), CO2g) andH20(0) at 25°C and 1 atm. pressure are 52,-394and-286 KJ mole 1 respectively. The enthalpy ofcombustion of C2H4 will be:-(1)+ 1412 KJ mole1(2)-1412 KJ mole1(3) + 142.2 KJ mole 14)-141.2 KJ mole1

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