Based on lessthanorequalto Chatelier\'s Principle in which direction will the fo

Question

Based on lessthanorequalto Chatelier's Principle in which direction will the following reaction proceed if it is already at equilibrium given the following change in conditions. A(g) + 2B(aq) rightarrow 2C(g) delta H_rxn = 25 kJ the temperature is increased. The volume of the reaction vessel in increased. Water is added to the reaction. Solid B is added to the flask, which subsequently dissolves in the aqueous solution increasing the concentration of B. A catalyst is added. Helium is pumped into the reaction flask increasing the total pressure of the system. Reaction will proceed in the forward direction to reestablish equilibrium. Reaction will proceed in the reverse direction to reestablish equilibrium. The reaction is still at equilibrium and will not change.

Explanation / Answer

There are six changes made in the equilibrium which has following effects:-

1) as it is an endothermic reaction increase in temperature will cause it to proceed in forward direction

2) Here volume is increased thereby decreasing the concentration of reactants as well as products but the decrease in concentration of reactant is high because volumes of reactant are more than that of products and ultimately the reaction will move in reverse direction.

3) Now when water is added the concentration of reactant B decreases which lead reaction to reverse direction.

4) By adding B will create opposite effect as by adding water and hence increase in concentration is noticed which will lead reaction in forward direction.

5) By adding catalyst at equilibrium there is no change in equilibrium because it enhances the rate of forward and backward reactions equally.

6) Increasing pressure of vessel will cause increase in concentration of reactants and will lead reaction in forward direction.

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