Molecular Mass Worksheet
A Grade 11 Chemistry worksheet focusing on calculating molecular mass and understanding its applications.
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Molecular Mass Worksheet
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Carefully read each question and provide the most accurate answer. Show all your work for calculation problems. Use the periodic table to find atomic masses.
1. What is the molecular mass of water (H₂O)? (Atomic masses: H=1.008 amu, O=15.999 amu)
17.007 amu
18.015 amu
19.007 amu
16.991 amu
2. Which of the following statements is TRUE about molecular mass?
It is measured in grams.
It is the sum of atomic masses of all atoms in a molecule.
It only applies to ionic compounds.
It is always a whole number.
3. The unit for molecular mass is .
4. Molecular mass is calculated by adding the of each atom in a molecule.
5. Calculate the molecular mass of glucose (C₆H₁₂O₆). (Atomic masses: C=12.011 amu, H=1.008 amu, O=15.999 amu)
6. A compound has the chemical formula Mg(OH)₂. Calculate its molecular mass. (Atomic masses: Mg=24.305 amu, O=15.999 amu, H=1.008 amu)
7. The molecular mass of a diatomic molecule like O₂ is twice the atomic mass of a single oxygen atom.
True
False
8. Ionic compounds have molecular masses, while covalent compounds have formula masses.
True
False
9. Explain why knowing the molecular mass of a substance is important in chemistry.