Molecular Mass Calculation Worksheet
A Grade 9 Science worksheet focusing on calculating molecular mass for various chemical compounds, aligning with chemistry standards.
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Molecular Mass Calculation Worksheet
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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?
CH₄
NH₃
H₂S
HCl
8. The molecular mass of glucose (C₆H₁₂O₆) is approximately:
120 g/mol
180 g/mol
240 g/mol
360 g/mol
9. The molecular mass of an element is the same as its atomic mass.
True
False
10. The molecular mass of a compound is always greater than the atomic mass of any single element within that compound.
True
False
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.