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

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Presentation on theme: "Percentage composition Indicates the relative amount of each element present in a compound."— Presentation transcript:

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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 elements 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, H 2 O. Step 1 – H- 2(1.01)= 2.02 O – 1(16.0)= 16.0 ________ 18.02

5 Step /18.02 X 100 = 11.21% 16.0 /18.02 X 100 = % Water is composed of % hydrogen and % 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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