Entropy Video Lessons

Concept

# Problem: For each pair of substances, at the same temperature, choose the one with the higher entropy:I. (i) I2(l) (ii) I2(s)II. (i) PCl3(g) (ii) PCl5(g)III. (i) BaI2(aq) (ii) BaI2(s)IV. (i) 2 moles of NO2(g) (ii) 1 mole of N2O4(g)a. (ii) (i) (i) (i)b. (i) (ii) (i) (ii)c. (i) (i) (ii) (i)d. (ii) (ii) (i) (i)e. (i) (ii) (i) (i)

###### FREE Expert Solution

We’re being asked to predict which has the greatest entropy (ΔS) for the given reactions. Recall that if:

• ΔS > 0 or ΔS = (+); entropy is increased

• ΔS < 0 or ΔS = (–); entropy is decreased

Remember that phase changes lead to a change in entropy:

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###### Problem Details

For each pair of substances, at the same temperature, choose the one with the higher entropy:

I. (i) I2(l) (ii) I2(s)

II. (i) PCl3(g) (ii) PCl5(g)

III. (i) BaI2(aq) (ii) BaI2(s)

IV. (i) 2 moles of NO2(g) (ii) 1 mole of N2O4(g)

a. (ii) (i) (i) (i)

b. (i) (ii) (i) (ii)

c. (i) (i) (ii) (i)

d. (ii) (ii) (i) (i)

e. (i) (ii) (i) (i)