Hey katie :
Molar mass of LiCl = 42.4 g/mol
Number of mole of LiCl = (given mass)/(molar mass)
= 202.7/42.4 => 4.78 moles of LiCl
Reaction taking place is :
2LiCl + Zn -- > ZnCl2 + 2Li
according to reaction :
2 mole of LiCl give 1 mole of ZnCl2
1 mole of LiCl give 1/2 mole of ZnCl2
4.78 mole of LiCl give (1/2)*4.78 mole of ZnCl2
number of mole of ZnCl2 formed = 2.39 moles
molar mass of ZnCl2 = 136.3 g/mol
mass of ZnCl2 formed = (number of moles of ZnCl2)*(molar mass)
= 2.39*136.3
= 325.8 g of ZnCl2
%yield = {(actual yiield)/(theoretical yield)}*100
= (297/325.8)*100
= 91.2 %
Answer : 91.2%
Hope that helps!
