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[ 2Al + 3CuCl_2 \rightarrow 2AlCl_3 + 3Cu ]
Your measured leftover was . That’s close! Small differences are due to handling, oxidation, or incomplete drying. Percent Yield of Copper (Another Common Question) Theoretical yield of Cu from 0.0372 mol CuCl₂ (1:1 mol ratio CuCl₂ to Cu): [ 0.0372 , \textmol Cu \times 63.55 , \textg/mol = 2.36 , \textg Cu ]