Enthalpy and Entropy

 1) The following reaction has an equilibrium constant of 0.25 at 830°C.

2SO₂(g) + O₂(g) 2SO₃(g)      ΔH = -197.78 kJ•mol^-1

Under which conditions will this reaction produce the most sulfur trioxide?

     (a) At higher temperatures.

     (b) At lower temperatures.

     (c) The amount produced does not depend on temperature.

     (d) More information is needed to answer the question.

 2) The following reaction has an equilibrium constant of 4.0 at 830°C.

2SO₃(g) 2SO₂(g) + O₂(g)     ΔH = 197.78 kJ•mol^-1

Under which conditions will this reaction produce the most sulfur dioxide?

     (a) At higher temperatures.

     (b) At lower temperatures.

     (c) The amount produced does not depend on temperature.

     (d) More information is needed to answer the question.

 3) The following reaction has an equilibrium constant of 216 at 25°C.

2NO₂(g) N₂O₄(g)     ΔH = -57.2 kJ•mol^-1

Under which conditions will this reaction produce the most N₂O₄?

     (a) At higher temperatures.

     (b) At lower temperatures.

     (c) The amount produced does not depend on temperature.

     (d) More information is needed to answer the question.

  4) The following reaction has an equilibrium constant of 4.64 x 10^-3 at 298K.

N₂O₄(g) 2NO₂(g)     ΔH = 57.2 kJ•mol^-1

Under which conditions will this reaction produce the most N₂O₄?

     (a) At higher temperatures.

     (b) At lower temperatures.

     (c) The amount produced does not depend on temperature.

     (d) More information is needed to answer the question.

 5) The following reaction has an equilibrium constant of 0.800 at 340°C.

PCl₅(g) PCl₃(g) + Cl₂(g)     ΔH = 87.9 kJ•mol^-1

Under which conditions will this reaction produce the most PCl₅?

     (a) At higher temperatures.

     (b) At lower temperatures.

     (c) The amount produced does not depend on temperature.

     (d) More information is needed to answer the question.

 6) The following reaction has an equilibrium constant of 0.083 at 900°C.

COCl₂(g) CO(g) + Cl₂(g)     ΔH = 107.655 kJ•mol^-1

Under which conditions will this reaction produce the most COCl₂?

     (a) At higher temperatures.

     (b) At lower temperatures.

     (c) The amount produced does not depend on temperature.

     (d) More information is needed to answer the question.