Question detail

What is the percentage yield if 20 grams of product is obtained from a theoretical yield of 50 grams?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Use of amount of substance in relation to masses of pure substances

Question

A. 40%
B. 50%
C. 60%
D. 20%

Answer

40%

Explanation

Percentage yield is calculated by (actual yield / theoretical yield) x 100. (20 g / 50 g) x 100 = 40%.

Common mistake

Rearranging the Equation

Students often confuse the rearrangement of the equation linking mass, relative formula mass, and moles, leading to incorrect formulas.

To rearrange the equation correctly, remember that mass = moles x relative formula mass. Ensure you isolate the variable you need by performing inverse operations.

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