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# Problem: Which of the following reactions will have a negative value of ∆S?(i) Ba2+(aq) + SO42-(aq) → BaSO4(s)(ii) 2 Na(s) + 2H2O(l) → 2 NaOH(aq) + H2(g)(iii) 2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(l)a. I and IIIb. I, II and IIIc. I and IId. II onlye. II and III

###### FREE Expert Solution

We’re being asked to predict the sign of the entropy change (ΔS) for the given reactions:

(i) Ba2+(aq) + SO42-(aq)  BaSO4(s)

(ii) 2 Na(s) + 2H2O(l)  2 NaOH(aq) + H2(g)

(iii) 2 C2H6(g) + 7 O2(g)  4 CO2(g) + 6 H2O(l)

Recall that if:

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

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

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###### Problem Details

Which of the following reactions will have a negative value of ∆S?

(i) Ba2+(aq) + SO42-(aq) → BaSO4(s)

(ii) 2 Na(s) + 2H2O(l) → 2 NaOH(aq) + H2(g)

(iii) 2 C2H6(g) + 7 O2(g) → 4 CO2(g) + 6 H2O(l)

a. I and III

b. I, II and III

c. I and II

d. II only

e. II and III

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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