Question
Methanol can be synthesized by combining carbon monoxide and hydrogen. CO(g) + 2H2(g)
Explanation / Answer
(1) If the temperature is raised , reaction will proced in the direcation in which some heat can destroy(absorbed) so thet atemperature of the system remains constant. Thus increase in temperature shifts the equilibrium in the forward direction of those reactions which proceed with absorption of heat ( endothermic reactions), and in the back ward direction of those reactions which proceed with the evolution of heat ( exothermic reactions) (2) If the pressure is increased , reaction will takes place in a direction which will bring about lowering f pressure.This implies that the equilibrium will shifts in the direction which produces the smaller no . of gas molecules. (3) If the concentration of reactants is increased or product is removed , the reaction will take place in the forward direaction. (4) Catalyst speeds up both forward & backward reactions to the same extent but does not haveany effect on Equilibrium point. (5)---> When the no. of moles of reactants & products are same the addition of inert gas has no effect ----> for a reaction at constant pressure ,addition of an inert gas will shifts the equilibrium in the direction in which there is increase in the no . of moles of the gases CO (g) + 2H2 (g) CH3OH (g) : H rxn = 90.7 kJ Since it is an endothermic reaction so increase in temperature of the reaction will shifts the Equilibrium towards backward that is towards to the reactants side. Among the given options we have to search for the reaction which affects the equilibrium towards to the backward direction. A. All the partial pressures will decrease ------> no effect if all the pressures decreases to same extent B. The partial pressure of methanol will decrease ---> forward reaction C. The partial pressures of hydrogen and methanol will decrease ---> forward reaction D. The partial pressure of hydrogen will increase ---> forward reaction E. The partial pressure of carbon monoxide will decrease ---> backward reaction