B. Do the following problems:
1. (After looking at #10, 11 on pg 190 - 191) Find the percentage composition of Iron oxide. A sample has 28 g iron and 12 g oxygen.
2. A sample of a sodium and oxygen compound containing 53g Na and 37g O.
3. (After looking at #12, 13, 14 on pg 192, 193, 194)A 39g sample of a gas contains 18g carbon and 21g nitrogen. What is the empirical formula?