1. Percent Composition

2. Dihydrogen dioxide
Formula ______ Mass H ___ % H ______ Molar mass ______ Mass O ___ % O ______

3. Beryllium nitride
Formula: _____ Mass Be _____ % Be ____ Molar mass: _____ Mass N ______ % N ____

4. Copper (II) hydroxide
Formula: _____ Mass Cu ____ % Cu _____ Molar mass: _____ Mass O _____ % O ______ Mass H _____ % H ______

5. Percent by Mass

6. I have 75 g of CuCl2, how many grams of copper are in the sample?

7. Mrs. Farrington has a stock bottle of potassium ferricyanide, K3Fe(CN)6 which contains a total of 500 grams. How many grams of nitrogen are in the bottle?

8. Mrs. Lambert has a stock bottle of sodium hydroxide that contains 355 g, with the following formula NaOH x 2H2O. She needs help to calculate the grams of water present in the hydrate.

9. Mrs.Brammell has a stock bottle of copper (II) sulfate, with the following formula CuSO4 x 8H2O. She needs help to calculate the percent of water present in the hydrate.