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AQA GCSE · Question 01.5 · Quantitative chemistry
The maximum theoretical mass of the salt that could be produced using 50 cm³ of the sulfuric acid is 12.5 g.
The percentage yield of the salt is 92.8%.
Calculate the mass of salt actually produced.
Use the equation:
% yield = (mass of salt actually produced / maximum theoretical mass of salt that could be produced) × 100
The maximum theoretical mass of the salt that could be produced using 50 cm³ of the sulfuric acid is 12.5 g.
The percentage yield of the salt is 92.8%.
Calculate the mass of salt actually produced.
Use the equation:
% yield = (mass of salt actually produced / maximum theoretical mass of salt that could be produced) × 100
How to approach this question
1. Write down the formula for percentage yield.
2. Rearrange the formula to make "mass of salt actually produced" the subject.
3. Substitute the given values for percentage yield (92.8%) and maximum theoretical mass (12.5 g) into the rearranged formula.
4. Calculate the final answer.
Full Answer
mass of salt actually produced = (% yield / 100) × maximum theoretical mass
mass of salt actually produced = (92.8 / 100) × 12.5 g
mass of salt actually produced = 0.928 × 12.5 g
mass of salt actually produced = 11.6 g
The formula for percentage yield is:
% yield = (actual yield / theoretical yield) × 100
We are given the % yield (92.8%) and the theoretical yield (12.5 g), and we need to find the actual yield (mass of salt actually produced).
First, we need to rearrange the equation to solve for the actual yield.
1. Divide both sides by 100:
(% yield / 100) = actual yield / theoretical yield
2. Multiply both sides by the theoretical yield:
actual yield = (% yield / 100) × theoretical yield
Now, substitute the values:
actual yield = (92.8 / 100) × 12.5
actual yield = 0.928 × 12.5
actual yield = 11.6 g
Common mistakes
✗ Multiplying percentage yield by theoretical mass without dividing by 100.
✗ Dividing theoretical mass by percentage yield.
✗ Rounding the answer incorrectly.
Practice the full AQA GCSE Chemistry Higher Tier Paper 1
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