The mass of copper obtained experimentally was 0.872 g. Calculate the percentage yield of copper.

% yield = (0.872 g Cu / 1.017 g ) x 100 = 85.74 %.

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the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.