Question

13. For a certain reaction AH =219 kJ and
AS" = -21 J/K. Determine whether the
reaction is spontaneous or nonspontaneous,​

Answer 1

Answer:

Accoding to Gibbs-Helmholtz equation,

Gibbs energy (ΔG)=ΔH−TΔS

Where , ΔH=Enthalpy change

ΔS =Entropy change

T=Temperature

For a reaction to be spontaneous

ΔG<0

∴ Gibbs -Helmholtz equation becomes,

ΔG=ΔH−TΔS<0

or , ΔH<TΔS

or, T>ΔHΔS=35.5KJmol−183.6JK−1mol−1=355×100083.6

=425K

T>425K