Answer to Question #38264 in Physical Chemistry for abhishek

Question

is it true that in a gaseous reaction where no' of molecules not change we can use vlumes of gases in place of their molar concentration to calculate the equilibrium constant why is it not so for the reactions where no. of molecules change?

Answer 1

This is because of dimensionality. If the number of moles in both part of the equation is equal, then the equilibrium constant is dimensionless, and there is no matter which value proportional to the amount of substance is used. However if the total moles in both part are not the same, you should follow the dimensionality of the equilibrium constant.