#actual yield

[betweenthebookshelves]

Lesson 5a: Theoretical, Actual, and Percent Yield.

Lesson 5a: Theoretical, Actual, and Percent Yield.

https://videopress.com/embed/2JEc18wZ?hd=0&autoPlay=0&permalink=0&loop=0 In which we explore theoretical and actual yields! And I make a personal record of how many times I can say, “My bad” onscreen. Trouble accessing the video? Check us out on YouTube! Questions, comments, concerns? Email us at [email protected]. Science rules!! x

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[daysfullofdreams]

help I haven't done grade 11 chemistry for two years how do you find the theoretical yield, actual yield and percentage yield?!

[destrucshann]

Theoretical Yield, Actual Yield, Percent Yield (in detail)

So, I know this is probably late, but I get questions (that I've ignored, lol sorry) about this a lot. And I guess it's also good to keep this here for future references, so here:

Theoretical yield is the part of the data that is calculated if/ when the experiment reaches its full capability. Usually, the theoretical yield is bigger than the actual yield. An example would be finding the mass of HCl if given 5g of H and 10g of Cl are added together. In order to find the theoretical yield, a balanced reaction is required. Then, find the limiting reactant by performing Stoichiometry. The reactant that produces the least number of the product is your limiting reactant and the amount you get from the limiting reactant is your theoretical yield.

Example:

   Balanced reaction

H2 + Cl2 = 2HCl

   Limiting reactant

5g H * 2 mol HCl  * 18g HCl = 180g HCl

(10g Cl * 2 mol HCl * 18g HCl) / 17g Cl = 21.18g HCl

Actual yield is the part of the data that is achieved after actually doing the experiment.  You can't calculate actual yield unless you perform algebra with it being "x". It is either given or obtained physically through an experiment. It is also usually less than the theoretical yield. In this case, let us pretend that the actual yield is 20.16g since I didn't do an experiment.   

Percent yield is achieved when you take the actual yield, divide it by the theoretical yield, and then multiply the answer by 100. The higher the percent yield, the better the results of your experiment.

Example:

Percent yield:

20.16g HCl / 21.18g HCl = .95g HCl * 100 = 95% HCl acquired