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6. If ΔH° for a reaction is +32 kJ and the Keq value at 25°C is...

6. If ΔH° for a reaction is +32 kJ and the Keq value at 25°C is 2.8 x 105 , what is the Keq value at 100°C?

a.   2.1 x 104

b.   7.0 x 104

c.   2.8 x 105

d.   3.8 x 106

e.   1.1 x 106

7. The graph below corresponds to a set of equilibrium constant values, K, measured at different temperatures. What type of reaction must this represent?

Ln K

0

a.   A reaction for which ΔH° <0 and ΔS° >0

b.   A reaction for which ΔH° =0 and ΔS° =0

c.   A reaction for which ΔH° >0 and ΔS° >0

d.   A reaction for which ΔH° <0 and ΔS° <0

e.   A reaction for which ΔH° >0 and ΔS° <0

8. Indicate which of the following is expected to have the largestt standard molar entropy (S°).

a. H2O (l)

b. H2O (g)

c. CH3OH(s)

d. H2O (s)

e. CH3OH (l)

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