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Calculating Percentage Composition in Chemistry

Learn how to determine the percentage composition of compounds by calculating molar mass and converting element masses to percentages. Step-by-step examples provided.

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Calculating Percentage Composition in Chemistry

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  1. Percentage Composition

  2. Percentage composition • Indicates the relative amount of each element present in a compound.

  3. Calculating percentage composition • Step 1 : Calculate molar mass • Step 2 : Divide the subtotal for each element’s mass by the molar mass. • Step 3: Multiply by 100 to convert to a percentage.

  4. What is the percent composition of water? Step 1 Calculate the molar mass of water, H2O. H: 2(1.01)= 2.02 O: 1(16.0)= 16.0 ________ 18.02 g/mol

  5. Example 2 • Calculate the percentage composition of sucrose , C12H22O11.

  6. Example 3 • Find the percentage composition of hydrogen in sulfuric acid.

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