Question

If you produce 14.5 g of O2 in the lab from a reaction that you showed by calculation could produce a maximum of 22.0 g of O2, what is your percent yield

Answer 1

Percent yield is simply the ratio of the actual mass produced over the theoretical mass that can be produced. Therefore the percent yield is calculated as:

% yield = (actual mass / theoretical mass) * 100%

% yield = (14.5 / 22.0) * 100%

% yield = 65.91%

Answer 2

By definition of percent yield, the percent yield of O₂ is 65.9%.

Theoretical yield

The theoretical yield is the maximum amount of product that can be produced in a reaction.

Actual yield

The actual yield is the amount of product actually obtained from a reaction.

In a chemical reaction, it may happen that the reactants do not react completely or their interaction generates other products, which decreases the yield of the reaction. So the actual yield is less than the theoretical yield.

Percent yield

Percent yield is a measure indicating the degree of success of a reaction and is defined as the ratio of actual yield to theoretical yield expressed as a percentage.

The expression that expresses the ratio of the yield percentage is:

$Percent yield=\frac{actual yield}{theoretical yield} x100$

Percent yield of O₂

In this case, you know:

• actual yield= 14.5 g
• theoretical yield= 22 g

Replacing in the definition of percent yield:

$Percent yield=\frac{14.5 grams}{22 grams} x100$

Solving:

Percent yield= 65.9 %

Finally, the percent yield of O₂ is 65.9%.

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