Chemistry, asked by nazakath2813, 10 months ago

A spontaneous reaction is impossible if
(a) both Δ H and Δ S are negative
(b) both Δ H and Δ S are positive
(c) Δ H is negative and Δ S is positive
(d) Δ H is positive and Δ S is negative

Answers

Answered by Anonymous
0

A spontaneous reaction is impossible if H is positive and Δ S is negative

option (d) right

Answered by bestwriters
0

A spontaneous reaction is impossible if (d) ΔH is positive and ΔS is negative.

Explanation:

A reaction is non-spontaneous when ΔH is positive and ΔS is negative.

When ΔH = + ve and ΔS is - ve

Now, the Gibbs free energy is given by the formula:

ΔG = ΔH - TΔS

ΔG = + ve - (T × - ve)

ΔG = positive + positive

∴ ΔG = positive

The value of the ΔG is positive during non-spontaneous process.

For spontaneous process, the Gibbs free energy is need to be negative and value of ΔH and ΔS are positive.

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