The equilibrium composition for the reaction `PCl_3+Cl_2``harr``PCl_5`at 298 K is given below:
`[PCl_3]_(eq)`=0.2 mol `L^-1`,`[Cl_2]_(eq)`=0.1 mol `L^-1`,`[PCl_5]_(eq)`=0.40 mol `L^-1`.
If 0.2 mol of `Cl_2` is added at the same temperature,the equilibrium concentrations of `PCl_5` is ______ `xx10^-2 mol L^-1`.
Given:`K_c` for the reaction at 298 K is 20