# Problem: Which one of the following reactions is likely to have a ΔS° close to zero (in other words, neither positive nor negative)? a) PCl 3(g) + Cl2(g) ⇌ PCl 3(g) b) 2KClO 3(s) ⇌ 2KCl(s) + 3O 2(g) c) CO(g) + H 2O(g) ⇌ CO 2(g) + H 2(g) d) CO 2(g) ⇌ CO 2(s) e) C 5H 12(l) + 8O 2(g) ⇌ 5CO 2(g) + 6H 2O(g)     Place the following compounds in order of increasing S°: PCl5(s)          PCl 5(g)          PCl 3(g) a) PCl5(s) &lt; PCl5(g) &lt; PCl3(g) b) PCl5(s) &lt; PCl3(g) &lt; PCl5(g) c) PCl5(g) &lt; PCl5(s) &lt; PCl3(g) d) PCl5(g) &lt; PCl3(g) &lt; PCl5(s) e) PCl3(g) &lt; PCl5(g) &lt; PCl5(s) f) PCl3(g) &lt; PCl5(s) &lt; PCl5(g)

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###### Problem Details

Which one of the following reactions is likely to have a ΔS° close to zero (in other words, neither positive nor negative)?

a) PCl 3(g) + Cl2(g) ⇌ PCl 3(g)

b) 2KClO 3(s) ⇌ 2KCl(s) + 3O 2(g)

c) CO(g) + H 2O(g) ⇌ CO 2(g) + H 2(g)

d) CO 2(g) ⇌ CO 2(s)

e) C 512(l) + 8O 2(g) ⇌ 5CO 2(g) + 6H 2O(g)

Place the following compounds in order of increasing S°:

PCl5(s)          PCl 5(g)          PCl 3(g)

a) PCl5(s) < PCl5(g) < PCl3(g)

b) PCl5(s) < PCl3(g) < PCl5(g)

c) PCl5(g) < PCl5(s) < PCl3(g)

d) PCl5(g) < PCl3(g) < PCl5(s)

e) PCl3(g) < PCl5(g) < PCl5(s)

f) PCl3(g) < PCl5(s) < PCl5(g)

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Entropy concept. You can view video lessons to learn Entropy. Or if you need more Entropy practice, you can also practice Entropy practice problems.

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Based on our data, we think this problem is relevant for Professor Thavarajah's class at TORONTO.