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i_love_science
- 80
- 2
Is percent yield based on grams or moles? Thanks.
Percent yield is a measure of the efficiency of a chemical reaction. It is the percentage of the theoretical yield (the maximum amount of product that could be produced) that is actually obtained in a reaction.
Percent yield is based on grams. It is calculated by dividing the actual yield (the amount of product obtained in a reaction) by the theoretical yield, and then multiplying by 100 to get a percentage.
Percent yield is important because it gives an indication of the success of a chemical reaction. A high percent yield indicates that the reaction was efficient and produced a large amount of product, while a low percent yield may indicate that there were errors or inefficiencies in the reaction.
Percent yield is affected by limiting and excess reactants because it is based on the actual amount of product obtained. If a reactant is limiting, it will be completely used up in the reaction and therefore the actual yield will be lower than the theoretical yield, resulting in a lower percent yield. If a reactant is in excess, there will be leftover after the reaction is complete, resulting in a higher actual yield and a higher percent yield.
Yes, percent yield can be greater than 100%. This can occur if there are errors in the experiment or if impurities are present in the product, resulting in a higher actual yield than the theoretical yield. However, a percent yield greater than 100% is not physically possible and may indicate that the experiment needs to be repeated or improved upon.