Indicate which one of the following reactions results in a positive ?Ssys. a. AgNO3(aq) + NaCl(aq)...

Question

Question

Indicate which one of the following reactions results in a positive ?Ssys.

a. AgNO3(aq) + NaCl(aq) <-->AgCl(s) + NaNO3(aq)

b. HCl(g) + H2O(l) <--> HCl(aq)

c. H2(g) + I2(g) <--> 2 HI(g)

d. C2H2O2(g) <--> 2 CO(g) + H2(g)

e. H2O(g) <--> H2O(aq)

The answer is D. Can someone please explain why? and how the answer was determined?

Answer 1

Answer #1

S system must imply: decrease of entropy, decrease of moles, or molecules more ordered

a) you are not increasing entropy since you are "ordering" to a more stable form of solid

b) you are getting rid of the most entropy leve which is gas to 1 mol of aqueous, which is ordered

c) You are changeing 2 moles which are randomly moving to 1 mol.. this is order

d) you are converting 1 mol of gas to 2 mol of gas, which are bvery entropic

e) gas to aqueous will always decrease entropy

The only "disordered" state will be D)

Answer 2

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