Actual yield of copper carbonate is 015g The question is using your data and knowing that sodium carbonate was in excess calculate the percent yield reaction with respect to the copper carbonate precipitate. Here is the method. Because there is always some loss of reactant due to different factors.
The copper was filtered off washed and dried.
A percent yield of 90 means the reaction was 90 efficient and 10 of the materials were wasted they failed to react or their products were not captured. Helmenstine holds a PhD. The copper was filtered off washed and dried. Trick to find Percent yield Actual yieldTheoritical yieldcalculated yield experimental yield.