Percent Composition by Mass Worksheet
A Grade 12 Chemistry worksheet focusing on calculating percent composition by mass for various compounds.
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Percent Composition by Mass
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Read each question carefully and calculate the percent composition by mass for the indicated elements. Show all your work and include appropriate units.
1. Calculate the percent composition by mass of carbon in C₁₂H₂₂O₁₁ (sucrose).
2. Determine the percent composition by mass of oxygen in H₂SO₄ (sulfuric acid).
3. The sum of the percent compositions of all elements in a compound should ideally add up to percent.
4. To find the percent composition by mass, you divide the mass of the in the compound by the total mass of the compound, then multiply by 100.
5. Which of the following compounds has the highest percentage of nitrogen by mass?
NO₂
N₂O
NH₃
N₂O₅
6. The empirical formula of a compound is always the same as its molecular formula.
True
False
7. A sample of a compound is found to contain 5.60 g of nitrogen and 16.0 g of oxygen. What is the empirical formula of this compound?
8. Imagine you are in a lab preparing a solution. What piece of glassware is commonly used for precise volume measurements, as shown in the image to the right?
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