1.

Delta_(f)U^(@) of formation of CH_(4)(g) at certain temperature is - 393 kJ mol^(-1). The value of Delta_(f)H^(@)

Answer»

ZERO
`lt Delta_(f)U^(@)`
`gt Delta_(f)U^(@)`
equal to `Delta_(f)U^(@)`

Solution :`Delta_(f) H^(@) = Delta_(f) U^(@) + DELTA n_(G) RT`
For the reaction,
`C(s) + 2H_(2)(g) rarr CH_(4)(g)`
:. `Delta n_(g) = 1 - 2 = - 1`
:. `Delta_(f) H^(@) = Delta_(f) U^(@) - 1 RT`
or `Delta_(f) U^(@) = Delta_(f) H^(@) + RT`
or `Delta_(f) H^(@) lt Delta_(f) U^(@)`


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