Recall that entropy is the degree of chaos or disorder of a system and that it depends on the following:
1. Phase: The gas phase has the highest entropy, followed by the liquid, and then the solid phase with the lowest entropy.
Gas > Liquid > Solid
2. Complexity: More elements in the compound leads to higher entropy.
Ex. NO3(g) [4 elements] has higher entropy than NO2(g) [3 elements].
3. Mass: The greater the mass, then the greater the entropy.
Ex. Xe(g) [greater mass] has higher entropy than He(g).
Which relationship or statement best describes ΔS° for the following reaction?
2 NH3(g) + 2 ClF3(g) → 6 HF(g) + N2(g) + Cl2(g)
A. ΔS° ≈ 0
B. ΔS° < 0
C. ΔS° > 0
D. ΔS°= ΔH°/T
E. More information is needed to make a reasonable prediction
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