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At some temperature, Kc for the reaction PCl5  PCl3 + Cl2 is 0.020. In one liter of solution, 0.10 mol PCl5 and 0.020 mol PCl3 are present initially. There is no Cl2 present initially. When the system comes to equilibrium, how much Cl2 will be present?

   a.    ) 0.020 mol 
   b.    ) 0.029 mol 
   c.    ) 0.052 mol 
   d.    ) 0.12 mol