Yield of reactions

i have a question, i cant understand how the answer is 20%
35g of molecular chlorine is reduced to 13,5g of zinc chloride using metallic zinc in excess
Zn+Cl2->ZnCl2
the answer is 20%
please help

35g of molecular chlorine is reduced to 13,5g of zinc chloride using metallic zinc in excess
Zn+Cl2->ZnCl2

the product isnt 0,1 mol and the reactant 0,2mol?
im confused
the yield is n product/n reactant or n reactant/n product ?

35g of molecular chlorine (Cl2) is 0.5mol. (MM of Cl x 2 = 35x2 = 70g/mol)
13.5g zinc chloride is 0.1 mol.
%yield rxn = 0.1/0.5 x 100 = 0.2 x 100 = 20%