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Percent Composition. Chem -To-Go Lesson 25 Unit Six. You’ll need a periodic table and calculator!. Concept of Percent Composition. Class of 1976’s 1 st Grade Picture. What’s the gender composition of the class?. Calculating percent composition of a chemical compound.

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## Percent Composition

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**Percent Composition**Chem-To-Go Lesson 25 Unit Six You’ll need a periodic table and calculator!**Concept of Percent Composition**Class of 1976’s 1st Grade Picture What’s the gender composition of the class?**Calculating percent composition of a chemical compound**Calculate the percent composition of Fe2O3. Equation NOTE: Percent composition is sometimes called percent by mass.**Slightly tougher example**• Calculate the percent by mass of Al in aluminum nitrate. • What’s the formula for aluminum nitrate? • What’s the total mass of the compound? • Set up the equation for Al’s portion.

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