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A reaction is spontaneous if free energy...

A reaction is spontaneous if free energy change `DeltaG` , for the reaction is negative . The question arises, how we can explain , the spontaneous of reversible reaction taking the example of dissociation equilibrium `N_2O_4 hArr 2NO_2(g)` the variation of free energy with the fraction of `N_2O_4` dissociated under standard conditions is shown in the figure below.

When 2 moles of `NO_2` change into equilibrium mixture the value of `DeltaG^@` is

A

`(5.40 +0.84)kJ`

B

`(5.40-0.84)kJ`

C

`(-5.40 -0.84)kJ`

D

`-5.40 kJ`

Text Solution

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The correct Answer is:
C
When 2 moles of `NO_2` change into equilibrium mixture, free energy is lowered by (5.40+0.84) kJ =6.24.
`DeltaG=-6.24 kJ`
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