Empirical and Molecular Formula Worksheet
This worksheet focuses on understanding and calculating empirical and molecular formulas for various chemical compounds, suitable for Grade 12 Chemistry students.
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Empirical and Molecular Formula Worksheet
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Read each question carefully and answer to the best of your ability. Show all work for calculations.
1. Which of the following statements is true regarding empirical and molecular formulas?
The empirical formula is always the same as the molecular formula.
The molecular formula is a simple whole-number multiple of the empirical formula.
Empirical formula gives the exact number of atoms in a molecule.
Molecular formula represents the lowest whole-number ratio of atoms.
2. The empirical formula of a compound can be determined from its percent by mass.
3. If the molar mass of a compound is known, the formula can be determined from the empirical formula.
4. A compound is found to contain 40.0% Carbon, 6.7% Hydrogen, and 53.3% Oxygen. Determine the empirical formula of this compound. (Atomic masses: C=12.01, H=1.008, O=16.00)
5. If the molar mass of the compound in Question 4 is 180.16 g/mol, what is its molecular formula?
6. C6H12O6 is both an empirical and a molecular formula.
True
False
7. The empirical formula of hydrogen peroxide is HO.
True
False