define percentage yield
Answers
Percent yield of the reaction is the percent ratio of actual yield to the theoretical yield. It is calculated to be the experimental yield divided by theoretical yield multiplied by 100%.
The theoretical yield is the amount predicted by a stiochiometric calculation based on the number of moles of all reactants present. This calculation assumes that only one reaction occurs and that the limiting reactant reacts completely.
The actual yield is the quantity of a product that is obtained from a chemical reaction.
If the actual and theoretical yield are the same, the percent yield is 100%. Usually, percent yield is lower than 100% because the actual yield is often less than the theoretical value. Reasons for this can include incomplete or competing reactions and loss of sample during recovery.
It's possible for percent yield to be over 100%, which means more sample was recovered from a reaction than predicted. This can happen when other reactions were occurring that also formed the product. It can also be a source of error, if the excess is due to incomplete removal of water or other impurities from the sample. Percent yield is always a positive value .Percent yield is a measure of how much of the reactants are converted to product. In practical terms you really have to pick your reactant (and, for that matter, product) if there are more than one of each. In a lot of cases the choices are obvious. If you are looking at converting carbon monoxide to carbon dioxide (2 CO + O2 -> 2 CO2) then percent yield is moles of CO2 divided by moles of CO * 100.
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Percent yield is the percent ratio of actual yield to the theoretical yield. It is calculated to be the experimental yield divided by theoretical yield multiplied by 100%. ... It's possible for percent yield to be over 100%, which means more sample was recovered from a reaction than predicted.