Question 1
Which of the following processes have a Δ
rS > 0?
◦ sodium chloride dissolves in pure water
◦ Ag
+(
aq) + Cl
-(
aq) → AgCl(
s)
◦ 2HBr(
g) → H
2(
g) + Br
2(
l)
◦ 2NH
3(
g) + CO
2(
g) → NH
2CONH
2(
aq) + H
2O(
l)
◦ lithium fluoride forms from Li and F
2Question 2
Which of the following processes have a Δ
rS = 0?
◦ carbon dioxide(
g) → carbon dioxide(
s)
◦ water freezes
◦ H
2(
g) + F
2(
g) → 2HF(
g)
◦ isopropyl alcohol vapour condenses
◦ methanol (
g, at 555 K) → methanol (
g, at 400 K)