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The standard Gibbs free energies (Delta(...

The standard Gibbs free energies `(Delta_(f) G^(@))` for the formation of `SO_(2)(g) and SO_(3)(g)` are `-300.0 and -371.0 kJ mol^(-1)` at 300 K respectively. `Delta G` for the reaction.
`2SO_(2)(g) + O_(2)(g) hArr 2SO_(3)(g)` is

A

1342 kJ

B

`-142 kJ`

C

`- 71 kJ`

D

`- 671 kJ`

Text Solution

Verified by Experts

The correct Answer is:
A
`2SO_(2)(g) + O_(2)(g) hArr 2SO_(3)(g)`
`Delta_(r) G^(@) = 2 Delta_(f) S^(@) (SO_(3)) - 2 Delta__(f) G^(@) (SO_(2)) - Delta_(f)^(@) (O_(2)`
`= 2(-371) - 2 (-300) - 0`
`= -742 + 600 = -142 kJ mol^(-1)`
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