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

17904 cal

18202 cal

18798 cal

19096 cal

Text Solution

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The correct Answer is:

`Delta H= 18500 = Delta E + Delta n_(g) RT or 18500= Delta E+ (-1) xx 2 xx 298 = 19096` cal

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