Molecular Mass Calculation Worksheet

Molecular Mass Calculation Worksheet

Read each question carefully and calculate the molecular mass for the given compounds. Show your work where indicated. Use the atomic masses from a periodic table (e.g., H=1.01, C=12.01, O=16.00, Na=22.99, Cl=35.45, S=32.07, K=39.10, N=14.01, Ca=40.08). Round your final answers to two decimal places.

1. Molecular mass is the sum of the   of all atoms in a molecule.

2. The unit for molecular mass is  .

3. To calculate molecular mass, you need to know the chemical   of the compound.

4. Calculate the molecular mass of water (H₂O). Show your work.

5. Determine the molecular mass of carbon dioxide (CO₂). Show your work.

6. What is the molecular mass of sodium chloride (NaCl)? Show your work.

7. Which of the following compounds has the largest molecular mass?

8. The molecular mass of glucose (C₆H₁₂O₆) is approximately:

9. The molecular mass of an element is the same as its atomic mass.

10. The molecular mass of a compound is always greater than the atomic mass of any single element within that compound.

11. Calculate the molecular mass of potassium sulfate (K₂SO₄). Show all steps.

12. A compound has the formula C₃H₈O. What is its molecular mass? Show your work.