Question

For a chemical reaction AH =
80 kcal/mol and AS = - 0.1 kcal/k mol then temperature for spontaneous reaction will be?
​

Answer 1

Answer:

Given ΔH=4kcalmol

−1

=4000calmol

−1

ΔS=10calmol

−1

k

−1

,ΔG=0

at equilibrium

ΔG=ΔH−TΔS

or

0=4000−T × 10or10T=4000

∴T=

10

4000

=400K

∴ At temperature above 400K the reaction is spontaneous.