Which of the following reactions is expected to have a positive Delta S value? (

Question

Which of the following reactions is expected to have a positive Delta S value? (Many of the substances below are not in Table 6. Use principles regarding the physical states of substances or the number of gas molecules on each side to determine whether disorder increases or decreases.) a. 2BaO_2(s) rightarrow 2 BaO(s) + O_2(g) b. NH_3(g) + HDr(g) rightarrow NH_4Br(s) c. 4NO_2(g) + O_2(g) rightarrow 2N_2O_5(g) d. Hg(l) + Cl_2(g) rightarrow HgCl_2(s) e. 2 Ag^+(aq) + CrO_4^2- (aq) rightarrow Af_2CrO_4(s)

Explanation / Answer

Q12

a) positive dS value... that is, incrase in entropy

a)

there is gas formation, so clearly chaos generated, dS > 0

b)

2 mol of gas form 1 mol of solid, there is decrase in chaos, so dS <0

c)

5 mol of gas form only 2, decrease in entropy, dS < 0

d)

1 mol of gas forms 1 mol of solid, so there is clearly a dS < 0

e)

3 ions form a single solid molecule, dS < 0 due to incrase in order

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