Molecular Mass and Mole Concepts and Problems

Conceptual and calculation questions on molecular mass and mole.

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1. How many atoms are in 16.3 g of S?

2. What is molecular mass (or molecular weight)?

3. What is the molar mass of an atom?

4. What is a mole (n)?

5. What is the formula for calculating molecular mass?

6. How many grams of Fe are in 2.5 moles of Fe?

7. How many moles of CO₂ are present in 22.4 g of CO₂?

8. How many oxygen atoms are present in 18.0 g of H₂O?

9. What is Avogadro’s number (Nₐ)?

10. How many moles of Ne are in 10.2 g of Ne?