Empirical and Molecular Formula Worksheet
Grade 9 Chemistry worksheet focusing on understanding and calculating empirical and molecular formulas.
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Empirical and Molecular Formula
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Read each question carefully and provide the best answer. Show all your work for calculation problems.
1. Which of the following statements best describes an empirical formula?
It shows the exact number of atoms of each element in a molecule.
It represents the simplest whole-number ratio of atoms in a compound.
It indicates the arrangement of atoms in a molecule.
It is always the same as the molecular formula.
2. What is the empirical formula for a compound with the molecular formula C6H12O6?
C6H12O6
CH2O
C2H4O2
CHO
3. The molecular formula of a compound is always a multiple of its empirical formula.
4. To determine the empirical formula from percent composition, you assume a gram sample of the compound.
5. Explain the difference between an empirical formula and a molecular formula.
6. A compound is found to contain 40.0% Carbon, 6.7% Hydrogen, and 53.3% Oxygen by mass. Determine the empirical formula of the compound. (Atomic masses: C=12.01, H=1.01, O=16.00)
7. The empirical formula of a compound is CH2, and its molecular mass is 70.13 g/mol. What is the molecular formula of the compound? (Atomic masses: C=12.01, H=1.01)
8. The empirical formula of water (H2O) is the same as its molecular formula.
True
False
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