A.) If the temperature is decreased and some C is added, how does this affect th

Question

A.) If the temperature is decreased and some C is added, how does this affect the amount of A present at equilibrium for the following reaction?
A(g) + B(g) 2 C(g) + D(g)           H° = -80 kJ

B.) How does an increase in temperature affect the equilibrium concentration of the SO2 and the equilibrium constant for the following reaction?
SO2(g) S(s) + O2(g)           H° = 297 kJ

C.) How would you change the volume of the reaction container that holds the following reaction in order to increase the yield of SF6?
S(s) + 3 F2(g) SF6(g)

D.) How does an increase in temperature affect the equilibrium concentration of C and the equilibrium constant for the following reaction?
2 A(g) + B(g) 3 C(g) + D(g)           H° = - 100 kJ

Cannot be predicted. The amount of A will not change. The amount of A will decrease. The amount of A will increase.

Explanation / Answer

A) The reaction is exothermic. Therefore, a decrease in temperature will move the reaction in forward direction. Adding C will move the reaction in Backward direction. We do not know the magnitudes of movement of forward and backward direction. Hence we cannot determine the net result. Therefore the answer is cannot be predicted

B) The reaction is endothermic and an increase in temperature will favor forward reaction. Therefore reaction moves in forward direction decreasing SO2.

[SO2] will decrease and the equilibrium constant will increase.

C) Decrease the volume of the container.

D) [C] will decrease and the equilibrium constant will decrease.

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