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The enthalpy of formation of methane (CH...

The enthalpy of formation of methane `(CH_(4))` at cosntant pressure and 300 k is - 78.84 kj. What will be enthalpy of formation at constant volume ?

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`C(s) + 2H_(2) (g) to CH_(4) (g)`
`Delta n(g) = 1 - 2 = - 1, Delta H = Delta U + Delta ng RT`
-78.84 = `Delta U + (-1) RT`
`Delta U = - 78.84 + 8.314 xx 10^(-3) xx 300 = - 78.84 + 2.49 = - 76.34`
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