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Yes, you will always be giving either the actual yield itself, or other information from which you have to calculate actual yield. By definition, you can't calculate percent yield without the actual yield.
The theoretical yield is found once you have done the limiting reagent calculations. So once you know which is the limiting reagent the theoretical yield is calculated by multiplying molar mass and number of moles of whichever product you are solving for.
One way I use to remember the formula for percent yield is that I know percent yield will always be under 100%. Therefore, the smaller value (actual yield) will always be divided by the larger value (theoretical yield). By using this, we will always know that the equation for percent yield = actual/theoretical
Reese - Dis 1G wrote:when finding the percent yield, is the actual yield always given to you?
Since percent yield= actual yield/theoretical yield, I would have to assume that you are always given the actual yield because you are only able to calculate the theoretical yield as the actual yield is almost always different due to error. In a problem where you must find percent yield, yes the actual yield will be given.
Actual yield should be given and if it is not then you cannot determine percent yield . The theoretical yield (what you'd calculate) is what would be produced in a perfect reaction with nothing lost (due to heat/ measuring errors/ etc.). The actual yield is usually an experimental value and therefore the higher your percent yield, the "better" you have conducted your experiment.
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