Question

18) Consider the reaction 2SO2(g)+O2(g)→2SO3(g)+189.4 KJ. Indicate the direction in which the equilibrium will shift wheni) tempreture is increasedii) Pressure is deacreasediii) He is added at constant volume.

Answer 1

ΔH = +189.4 KJ

Hence, the forward reaction is endothermic as the value of ΔH is positive

i) Increase in temperature favours endothermic reactions so, the reaction will move forward i.e. the value of forward reaction will be greater than that of backward reaction.

ii) By increasing pressure, the reaction will move in the direction where the numbers of moles are less. In this reaction, the number of moles is less for the product so the reaction will move forward.

iii) He will have no effect on the equilibrium