Question

Consider the reaction: PCl5 (g) ↔ PCl3 (g) + Cl2 (g) and the thermodynamics data of reacting species at the standard state and 298.15 K. Species ΔHfo (kJ/mol) Sfo (J/mol K) PCl5 (g) -374.9 364.6 PCl3 (g) -287.02 311.67 Cl2 (g) 0 222.97 Which of the following statements is/are correct? a) At 298.15 K, the reaction has a total entropy of the universe ΔSo(Universe) > 0. Note that the temperature of the surroundings is also 298.15 K. b) At 298.15 K, the standard Gibbs energy change of the reaction is close to ΔGo = 37.18 kJ (between 37.10 and 37.30). c) When the temperature is increased from 298.15 K to 498.15 K, the equilibrium constant of the reaction will increase. a) only b) only c) only a) and b) b) and c) a) and c) a), b) and c) None of the 3 statements is correct.

          Consider the reaction: PCl5 (g) ↔ PCl3 (g) + Cl2 (g) and the thermodynamics data of reacting species at the standard state and 298.15 K.

Species     ΔHfo (kJ/mol)     Sfo (J/mol K)
PCl5 (g)    -374.9            364.6
PCl3 (g)    -287.02           311.67
Cl2 (g)     0                 222.97

Which of the following statements is/are correct?
a) At 298.15 K, the reaction has a total entropy of the universe ΔSo(Universe) > 0. Note that the temperature of the surroundings is also 298.15 K.
b) At 298.15 K, the standard Gibbs energy change of the reaction is close to ΔGo = 37.18 kJ (between 37.10 and 37.30).
c) When the temperature is increased from 298.15 K to 498.15 K, the equilibrium constant of the reaction will increase.

a) only
b) only
c) only
a) and b)
b) and c)
a) and c)
a), b) and c)
None of the 3 statements is correct.

Added by Michael W.

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