fill in blanks according to the numbers given. please show calculation

1. Mass of empty test tube 20.8062 g

2. Mass of copper oxide + test tube 22.5450g

3. Mass of copper + test tube 22.1919 g

4. Mass of copper oxide _____g

5. Mass of copper ______ g

6. Mass of oxygen ______g

7. Moles of copper (use atomic mass of Cu) ______mol

8. Moles of oxygen (use atomic mass of O)______ mol

9. Empirical formula of copper oxide __________