$PC{l_5}(g) \to PC{l_3}(g) + C{l_2}(g)$
In the above first order reaction the concentration of PCl₅ reduces from initial concentration 50 mol L^$-$1 to 10 mol L^$-$1 in 120 minutes at 300 K. The rate constant for the reaction at 300 K is x $\times$ 10^$-$2 min^$-$1. The value of x is __________. [Given log5 = 0.6989]