Guided Reading Worksheet – Chemistry Matter & Change – Chapter 11 – The Mole
NAME: _______________________
DATE: _______________
Section 11.4 – Empirical and Molecular Formulas
1. What is the difference between a synthetic chemist and an analytical chemist?
2. What does the term percent mean?
3. Determine the percent composition of the elements that are in water.
4. What is the general equation for calculating the percent by mass of any element in a compound?
5. Determine the percent composition of the elements in NaHCO3.
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6. IF the empirical formula is NOT the same as the actual molecular formula of a compound, what
must be true about the molecular formula? Give an example.
Guided Reading Worksheet – Chemistry Matter & Change – Chapter 11 – The Mole
7. When calculating the empirical formula and the percent composition of the elements are give what
can you assume about the total mass of the compound and about the percent by mass of each
element in the compound?
8. Determine the empirical formula for methyl acetate, which has the following chemical make-up:
48.64% carbon, 8.16% hydrogen, and 43.20% oxygen.
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9. How is a molecular formula of a compound different from the empirical formula of the same
compound?
10. Succinic acid is composed of 40.68% carbon, 5.08% hydrogen, and 54.24% oxygen and has a
molar mass of 118.1 g/mol. Determine the empirical and molecular formulas for succinic acid.
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11. What is the key to determining the empirical and molecular formulas from percent composition?
12. A sample of ilmenite is found to contain 5.41g iron, 4.64g titanium, and 4.65 g oxygen.
Determine the empirical formula for ilmenite.
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