Percentage Composition Worksheet
Calculate percentage composition of various compounds and elements in this Grade 11 Chemistry worksheet.
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Percentage Composition Worksheet
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Read each question carefully and calculate the percentage composition as requested. Show all your work for full credit. Use atomic masses: H=1.01, C=12.01, O=16.00, Na=22.99, S=32.07, Cl=35.45, K=39.10, Fe=55.85, Cu=63.55.
1. Calculate the percentage composition of carbon in glucose (C₆H₁₂O₆).
2. Determine the percentage of oxygen in potassium chlorate (KClO₃).
3. The sum of the percentage compositions of all elements in a compound should ideally add up to .
4. Percentage composition is a measure of the relative amount of each in a compound.
5. Which of the following compounds has the highest percentage by mass of sulfur?
SO₂
SO₃
H₂S
Na₂SO₄
6. A compound is found to contain 2.64 g of carbon, 0.33 g of hydrogen, and 3.52 g of oxygen. Calculate the percentage composition of each element in the compound.
7. Iron pyrite, also known as 'fool's gold', has the chemical formula FeS₂. Calculate the percentage by mass of iron and sulfur in iron pyrite.
8. The percentage composition of an element in a compound is independent of the sample size.
True
False
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