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A reaction is spontaneous if free energy...

A reaction is spontaneous if free energy change `Delta G` for the reaction is negative . The question arises, how we can explain , the spontaneous reversible reaction. Taking the example of dissociation equilibrium `N_2 O_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 1 mole of `N_2O_4` changes into the equilibrium mixture the value of `DeltaG^@` is

A

a) `0.84 kJ`

B

b) `-0.84 kJ`

C

c) `5.40 + 0.84 kJ`

D

d) `0.84-5.40 kJ`

Text Solution

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The correct Answer is:
B
The lowest point of the plot represents equilibrium mixture. When 1 mole of `N_2O_4` changes into equilibrium mixtture , free energy is lowered by 0.84 kJ, `DeltaG=-0.84 KJ`.
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