Chapter 17

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1 point

Which of the following is consistent with a reaction at equilibrium?

G = 0, Q = K

G = 0, Q > K

G > 0, Q = K

G < 0, Q = K

G = 0, Q < K

1 point

Determine the equilibrium constant (Kp) at 25C for the reaction:
CO(g) + H2O(g) CO2(g) + H2(g).
G = –28.5 kJ/mol

2.9 10^–60

1.0 10^–4

1.2

1.0 10^5

3.4 10^59

1 point

Which of these species would you expect to have the lowest standard entropy (S)?

CH4(g)

HF(g)

NH3(g)

H2O(g)

1 point

Determine S for the reaction SO3(g) + H2O(l) H2SO4(l).

169.2 J/K·mol

1343.2 J/K·mol

–169.2 J/K·mol

–29.4 J/K·mol

29.4 J/K·mol

1 point

Select True or False: The entropy of a perfectly ordered crystalline substance at 0 K is 0 J/mol.  Bloom's Level: Understand

True

False

1 point

Which of the following processes would be accompanied by an increase in entropy?

H2O(g) H2O(s)

H2O(l) H2O(s)

H2O(g) H2O(l)

H2O(s) H2O(g)

H2O(l, 50C) H2O(l, 25C)

1 point

Which of these species has the highest entropy (S) at 25C?

CH3OH(l)

CO(g)

MgCO3(s)

H2O(l)

Ni(s)

1 point

The reaction rates of many spontaneous reactions are actually very slow. Which of these statements is the best explanation for this observation?

Kp for the reaction is less than one.

The activation energy of the reaction is large.

G for the reaction is positive.

Such reactions are endothermic

The entropy change is negative.

1 point

Determine the equilibrium constant Kp at 25C for the reaction N2(g) + 3H2(g) 2NH3(g).  [Gf (NH3(g)) = –16.6 kJ/mol]

1.52 10^–6

6.60 10^5

8.28 10^–2

2.60

13.4

10.

1 point

Select True or False: For a given substance the entropy always increases in the following order:  S (gas) < S (liq) < S (solid).

True

False

11.

1 point

With respect to the system only, a reaction with H < 0 and S > 0 is predicted to be:

Spontaneous at all temperatures

Spontaneous at high temperatures only

Spontaneous at low temperatures only

Nonspontaneous at all temperatures

12.

1 point

Which of these species would you expect to have the highest standard entropy (S)?

CH4(g)

C2H2(g)

C2H4(g)

C2H6(g)

C3H8(g)

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