Question

If for a certain reaction 4 H is 30 kJ molt at 450 K, the value of AS (in JK-1 moll) for which the same reaction will be spontaneous at the same temperature is ​

Answer 1

Answer:

Given, ΔH=−400kJmol

−1

ΔS=−20kJmol

−1

K

−1

Gibbs Helmholtz equation is given by:

ΔG=ΔH−TΔS

For a reaction to be spontaneous, ΔG must be less than 0, i.e., negative.

∴0≥ΔH−TΔS

TΔS≥ΔH

The temperature below which the reaction is spontaneous is:

T=

ΔS

ΔH

=

−20

−400

=20 K