Question

A reaction occurs spontaneously if
(a) TΔS < ΔH and both ΔH and ΔS are + ve
(b) TΔS > ΔH and ΔH is + ve and ΔS is - ve
(c) TΔS > ΔH and both ΔH and ΔS are + ve
(d) TΔS = ΔH and both ΔH and ΔS are + ve

Answer 1

Answer:

sorry it is tough as I'm in junior class

Answer 2

A reaction occurs spontaneously if  (c) TΔS > ΔH and both ΔH and ΔS are + ve.

Explanation:

• When a reaction is spontaneous, then the Gibbs free energy is negative.
• The Gibbs free energy is given by the formula:
• ΔG = ΔH - TΔS
• When the value of ΔH and ΔS are positive then TΔS > ΔH from which the value of ΔG is negative.
• If the value of ΔH = + ve and ΔS is - ve, the Gibbs free energy results in positive which is a non-spontaneous process.