2. Calculating Percent Yield Chapter 10.3

3. Intro to Percent Composition The number of percent values in the percent in the percent composition of a compounds is many as there are different elements in the compound

4. Which has a higher percent of chromium (Cr)?

5. Percent Composition You can use percent composition to calculate the number of grams of an element in a given amount of a compound.

6. Empirical Formula An empirical formula of a compound gives the simplest whole number ratio of the atoms of the elements in a compound

7. Empirical Formula Empirical Formula ≠ Molecular Formula

8. Example Empirical Formula: CH C2H2C2H2C2H2C2H2 C4H4C4H4C4H4C4H4 C6H6C6H6C6H6C6H6

9. Fill in the labels oxygen 6.02 x 10 23 3 6.02 1

10. Molecular Formula The molecular formula of a compound is either the same as its empirical formula or a whole number multiple of it.

11. Empirical  Molecular In order to calculate the molecular formula, you must know the compound’s molar mass

12. Empirical  Molecular If you divide the molar mass of a compound by the empirical formula mass you get the number that you will multiply the subscripts by