Question

Calculate no: of moles of cl2 produced at equilibrium when 1 mole of pcl5 is heated in 10 DM vessel kc 0.041

Answer 1

What do you mean by a 10 DM vessel. Is that 10 dm^3 vessel. If I assume that then the (PCl5) = 0.1. If that isn't right correct accordingly.
......PCl5 ==> PCl3 + Cl2
I......0.1......0......0
C......-x.......x......x
E......0.1-x....x......x

Substitute the E line into the Kc expression and solve for x

Answer 2

0.0467