1. How many atoms are in 2.7 g of iron?

2. How many moles are in 15 grams of lithium?

3. How many atoms are in 3.6 moles of selenium?

4. Determine the mass of 2.4 moles of sulfur.

5. How many moles are in 8.6 x 1023 atoms of plutonium?

6. How many moles are in 22 grams of argon?

7. How many particles are in 27.6 grams of krypton?

8. Determine the number of moles of 2.25 x 1025 atoms of zinc.

9. How many grams are in 88.1 moles of magnesium?

10. How many moles are in 2.3 grams of phosphorus?

11. Determine the mass of 4.86 x 1024 atoms of lithium.

12. What is the mass of 11.9 moles of chromium?

13. How many moles are in 9.8 grams of calcium?

14. Determine the number of moles of 1.05 x 1018 particles of mercury.

15. How many grams are in 238 moles of arsenic?

16. What is the mass of 4.86 x 1024 particles of gold?

17. Determine the number of moles in 4.5 x 1012 atoms of chlorine.

18. What is the number of moles in 0.00750 g of silver?

19. Determine the number of atoms in 5.87 g of nickel.

20. What is the mass of 1.5 x 1023 particles of magnesium?