An equilibrium mixture of 2 moles each of #PCl_5#, #PCl_3# and #Cl_2# in V ltrs. in T temp. has a total pressure of 3 atm. #Cl_2# is added at the same temp. and pressure till the volume is doubled. What is the number of moles of #Cl_2# added? Thank you:)
The chemical equation is
First, we have to find the equilibrium constant
At the new equilibrium point, amount of
Here you obtain two equations:
(1) Since the volume is doubled at the constant pressure and temparature, the total amount of substance must be doubled too.
(2) The equilibrium constant doesn't change since the temparature is the same .Though, the volume is now
Multiply equation (B) by