Molecular Mass Calculation Worksheet
A Grade 12 Chemistry worksheet covering the calculation of molecular mass for various compounds, including definitions and application.
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Standards
Topics
Molecular Mass Calculation
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Read each question carefully and provide accurate answers. Show all your calculations for molecular mass problems.
1. Which of the following best defines molecular mass?
The mass of an atom in grams.
The sum of the atomic masses of all atoms in a molecule.
The number of protons and neutrons in an atom.
The mass of a single proton.
2. What are the common units for molecular mass?
Grams (g)
Kilograms (kg)
Atomic Mass Units (amu)
Litres (L)
3. To calculate the molecular mass of a compound, you need to sum the of all the atoms present in its chemical formula.
4. The molecular mass of water (H₂O) is approximately amu.
5. Calculate the molecular mass of carbon dioxide (CO₂). Show your work. (Atomic masses: C = 12.01 amu, O = 16.00 amu)
6. Determine the molecular mass of glucose (C₆H₁₂O₆). Show your work. (Atomic masses: C = 12.01 amu, H = 1.01 amu, O = 16.00 amu)
7. Molecular mass and molar mass refer to the exact same quantity and are always expressed in the same units.
True
False
8. The molecular mass of a diatomic molecule like O₂ is twice the atomic mass of a single oxygen atom.
True
False
Use the words below to complete the sentences.
9. Molecular mass is the sum of the of all atoms in a .
10. While molecular mass is typically expressed in , molar mass is expressed in per mole.