Consider the following system which has been shown to be spontaneous at 298K and

Question

Consider the following system which has been shown to be spontaneous at 298K and select the true statement below.

N2(g) + 3H2(g) ? 2NH3(g)



A. the ?S for the system is predicted to be negative, so therefore the ?S for the surroundings must be positive to a greater extent so that the the net ?S for the universe is positive
B. the ?S for the system is predicted to be positive, so therefore the ?S for the surroundings must be positive also so that the the net ?S for the universe is positive
C. the ?S for the system is predicted to be positive, so therefore the ?S for the surroundings must be negative to a lesser extent so that the the net ?S for the universe is positive
D. the ?S for the system is predicted to be negative, so therefore the ?S for the surroundings must be positive to a lesser extent so that the the net ?S for the universe is negative

Explanation / Answer

since the moles of gas decreases, entropy of the system decreases making ?S of system negative

but it's a spontaneous reaction so entory of unverse increases making ?S of universe positive

thus, ?S surroundings has to compensate by being a greater positive to result in a overall positive ?S

making answer choice A correct

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