10. If a reaction has ΔS = - 100 J/K and is spontaneous, what must be true of the surroundings? A) ΔSsurroundings > 100 J/K B) ΔSsurroundings > - 100 J/K C) ΔSsurroundings = 100 J/KD) ΔSsurroundings < - 100 J/K E) ΔSsurroundings < 100 J/K

Question

Thelma

Chemistry

1 March, 01:53

10. If a reaction has ΔS = - 100 J/K and is spontaneous, what must be true of the surroundings? A) ΔSsurroundings > 100 J/K B) ΔSsurroundings > - 100 J/K C) ΔSsurroundings = 100 J/KD) ΔSsurroundings < - 100 J/K E) ΔSsurroundings < 100 J/K

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Jamison · Answer 1

Answer : The correct option is, (C) ΔS (surroundings) = 100 J/K

Explanation:

As we know that:

ΔS (total) = ΔS (system) + ΔS (surroundings)

When the reaction is spontaneous ΔS (total) > 0, that means positive value.

When the reaction is non-spontaneous ΔS (total) < 0, that means negative value.

As we are given that:

ΔS (system) = - 100 J/K (for spontaneous reaction)

Thus, the ΔS (surroundings) must be greater than ΔS (system) that means positive value.

So, ΔS (surroundings) = 100 J/K

Hence, the correct option is, (C) ΔS (surroundings) = 100 J/K