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Percent Composition

Percent. Short for per centum

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Percent Composition

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    1. Percent Composition Parts of a Whole

    2. Percent Short for per centum…”by the hundred” Part of a whole If there are 10 people in a room and 4 of them have blue eyes, what percentage of people have blue eyes?

    3. Composition Chemical formula Molar mass

    4. Percent Composition Write the formula Find the molar mass Determine the percentage of the part in question

    5. Problem #1 Determine the percent composition of water.

    6. Problem #1—Step 1 Write its formula H2O

    7. Problem #1—Step 2 Determine its molar mass H—2 x 1.01 = 2.02 O—1 x 16.00 = 16.00 18.02 g/mol

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