Question

question 8 (1 point) what is the possible reason for a yield percent greater than 100% in this lab? the collected copper was not completely dry in the oven. reaction in the solution wasnt complete copper was not collected completely and there was a loss of this product. the amount of aluminum present was not enough and it became the limiting reagent in the reaction process.

Explanation:

If the collected copper was not completely dry in the oven, there would be residual water. This would make the measured mass of copper (the actual yield) higher than the theoretical yield. When calculating percent yield ($\text{Percent Yield}=\frac{\text{Actual Yield}}{\text{Theoretical Yield}}\times100\%$), a higher actual - yield due to water content would result in a percent yield greater than 100%.

• If the amount of aluminum was not enough (limiting reagent), it would lead to a lower actual yield (less copper produced), so percent yield would be less than 100%.
• If copper was not collected completely (loss of product), actual yield would be lower, so percent yield would be less than 100%.
• If the reaction in the solution wasn't complete, less copper would be produced (lower actual yield), so percent yield would be less than 100%.

Answer:

The collected copper was not completely dry in the oven.