Question

4moles of an equimolar mixture of cl2and N2 are added to a vessel containing 1 mole of PCl5,2moles of PCl3,and 3 moles of Cl2 at equilibrium,the mole fraction of PCl5 at equilibrium will be?

Answer 1

Cl2 + PCl3 = PCl5

2 mol Cl2 + 2 mol PCl3 = 2 mol PCl5

So, final

Cl2 = 3 mol;

N2 = 2 mol;

PCl3 = 0 mol;

PCl5 = 3 mol

Total = 8 mol;

X(PCl5) = 3*100/8 = 37,5 %