Percent. Short for per centum
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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
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
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