The enthalpy of formation of methane C((...

The enthalpy of formation of methane `C_(( S))+2H_(2(g)) rarr CH_4(g) ` at constant pressure is 18500 cal at `25^@ C.` The enthalpy of reaction at constant volume would be

19096 cal

18789 cal

18202 cal

17904 cal

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The correct Answer is:

`Delta H = 18500 = Delta U + Deltan RT` or `18500+596 = 19096 ` cals.

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