How do i find the theoretical and actual yield given the amnts of reagents?

To get theoretical yield, you need to determine the moles of each reactant, then, with the values from the balanced equation determine the limiting reagent (the one that runs out first), this is the one you use to calculate moles of product that could theoretically be made. This is the theoretical yield.

To get actual yield, you need to run the experiement and determine the actual weight of isolated product; you divide this by the theoretical weight that should have been produced (see above) and multiply by 100%.

Theoretical Yield: First find which reagent is the limiting reagent.

Take grams of one reagent times its molecular weight (g/mol) to convert to moles. use the reaction coefficients in the balanced equation (ex: 2OH or H2O. The whole number written before a molecule) to make a ratio between the reactant and the product for which you're finding yield. (2 moles OH contribute to 1 mole H2O [a completely hypothetical use of compounds for the purpose of showing you the process for yield] so the ratio would be 1/2. PRODUCT over REACTANT so that you can cancel out the units of the reactant for yield of product).

Write out this way:

grams reactant x mol/g (molecular weight) reactant x mol prod/mol reactant = moles product yielded.

If you need the mass of the product yield, just use the product's molecular weight to convert from moles to grams.

Repeat this with the other reagent(s) and use the yield of the one producing the least amount of product. This must be done because the limiting reagent will run out before the others, so the other reagents will be excess and COULD make more product if more of the limiting reagent were provided. This least amount of calculated yield is your theoretical yield.

Actual Yield:

This is the amount of product you made experimentally. This will be the moles or grams(mass) of product you were able to measure after performing the experimental reaction. This is usually given to you or measured by you after an experiment.

You use the theoretical and actual yields to calculate percent yield. You can do this with grams or moles, as long as the actual yield units are the same as you use for the theoretical units).

% yield = 100 x (actual yield / theoretical yield)

ex: 100 x (82g / 95g) = 86.3% yield. (in accurate sig. figures=86%)

Good luck! :)

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RE:

How do i find the theoretical and actual yield given the amnts of reagents?

How To Calculate Actual Yield

How To Find Actual Yield

mmmm, sorry - one of us must have access to the chemical equation the reagents are involved in.

product molecular weight divided by starting material(which has to be reactant) multiply by how much gram u had taken