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Calculating Percentage Composition of Compounds

Learn how to determine the percentage composition of compounds by calculating molar mass and dividing element masses, with examples for water, sucrose, and sulfuric acid.

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Calculating Percentage Composition of Compounds

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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. Example 1 • 1. Calculate the molar mass of water, H2O. • Step 1 – H- 2(1.01)= 2.02 • O – 1(16.0)= 16.0 • ________ • 18.02

  5. Step 2 2.02/18.02 X 100 = 11.21% • 16.0 /18.02 X 100 = 88.79 % • Water is composed of 11.21 % hydrogen and 88.79 % oxygen.

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

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

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