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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_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.

The standard free energy change for the conversion of 1 mole of `N_2O_4` into 2 moles of `NO_2` is

A

a) `5.40 kJ`

B

b) `-5.40 kJ`

C

c) `(5.4+0.84 )kJ`

D

d) `(5.40 +2`x`0.84)kJ`

Text Solution

Verified by Experts

The correct Answer is:
A
`DeltaG=G` for 2 moles of `NO-2-G` for 1 mole of `N_2O_4`
=5.40 kJ
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