What is the percent yield in this reaction if the theoretical yield of Zn is 12 g and the actual yield of Zn is 9 g?Answer the question using the balanced equation below: Ca + ZnCO3 → CaCO3 + Zn...

What is the percent yield in this reaction if the theoretical yield of Zn is 12 g and the actual yield of Zn is 9 g?

Answer the question using the balanced equation below:

Ca + ZnCO3 → CaCO3 + Zn

What is the percent yield in this reaction if the theoretical yield of Zn is 12 g and the actual yield of Zn is 9 g? Show your work, including all conversion factors and all units.

Expert Answers
sanjeetmanna eNotes educator| Certified Educator
Percentage yield is calculated using the mass of the actual product obtained from the experiment and the theoretical mass of the product calculated using the balanced equation of the reaction.
 

The general mechanism for finding percentage yield is as follows: 

1.  Balance the chemical equation 
2.  Find the limiting reagent 
3.  Find the theoretical yield 
4.  Find the actual yield
5.  Find the percentage yield

1.  Balance the chemical equation

Ca + ZnCO3 → CaCO3 + Zn 

Since theoretical yield (how much product will be synthesized in ideal conditions that is from the reaction by using limiting reactant ) and actual yield ( how much product was actually synthesized in the lab ) is given we can directly enter into step 5.

5.  Find the percentage yield

% yield = (mass of actual yield / mass of Theoretical yield) * 100

% yield = (9 g / 12 g) * 100

% yield = 0.75 * 100

% yield = 75 %

The percentage yield is 75%.
cgrant2 | Student

The percent yield = (actual yield/theoretical yield) x 100 

We know that: 

a. Actual yield for Zn is 9g 

b. Theoretical yield for Zn is 12g 

Let plug in the numbers : 

(9g/12g) x 100 = 75% 

The percent yield is 75% 

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