Quiz: Calculating Percentage Composition by Mass
AQA GCSE Chemistry (8462)
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Building on your learning about conservation of mass, balanced equations, and relative formula mass, let's test your understanding of calculating percentage composition by mass!
What does percentage composition by mass represent in a compound?
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Calculate the percentage composition by mass of carbon in carbon dioxide (CO₂). (Relative atomic masses: C = 12, O = 16)
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Which steps are required to calculate percentage composition by mass? (Select all that apply)
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The formula for percentage composition is \( \frac{\text{mass of element in compound}}{\text{{blank0}}} \times 100 \).
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Which of the following compounds has the highest percentage composition by mass of oxygen?
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Calculate the percentage composition of hydrogen in water (H₂O). (Relative atomic masses: H = 1, O = 16)
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Match the items on the left with their correct pairs on the right
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Match the items on the left with their correct pairs on the right
A compound contains 20g of sodium and 30g of chlorine. What is the percentage composition of sodium? (Relative formula mass: 50)
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Calculate the percentage composition of sodium in sodium chloride (NaCl). (Relative atomic masses: Na = 23, Cl = 35.5)
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