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Principles of Chemistry

Principles of Chemistry. Chapter 11 Review. Format of Exam. All problem solving Two periods Calculators and periodic tables 20 questions (5 points each). Four Sections. Mole conversions (8) Percent composition (4) Empirical and molecular formulas (4) Hydrates (4).

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Principles of Chemistry

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  1. Principles of Chemistry Chapter 11 Review

  2. Format of Exam • All problem solving • Two periods • Calculators and periodic tables • 20 questions (5 points each)

  3. Four Sections • Mole conversions (8) • Percent composition (4) • Empirical and molecular formulas (4) • Hydrates (4)

  4. Mole Conversion Examples 1. How many molecules of CO2 are in 5.0 mol?

  5. Mole Conversion Examples 2. How many mol in 6.10 g of nitric acid?

  6. Mole Conversion Examples 3. How many atoms in 2.03 g of Cu?

  7. Mole Conversion Examples 4. How many grams in 4.00 x 10 26 molecules of sodium sulfide?

  8. Percent Composition 1. Find percent composition of oxygen in sulfurous acid.

  9. Percent Composition 2. Find percent composition of phosphorus in zinc phosphite.

  10. Empirical/Molecular Formulas • Find for a chemical that is 37.51% C, 4.20 % H, and 58.29% O. Its molecular weight is 768.56 g/mol.

  11. Empirical/Molecular Formulas • Find for a chemical that is 52.11% C, 13.14% H, and 34.75% O. Molecular weight is 230.39 g/mol.

  12. Hydrates • A hydrate of Na2SO4is found to have a mass of 63.5 grams. After the water is driven off, the anhydrous weighs 45.99 g. Find the formula and name of the hydrate.

  13. Hydrates • A 20.g sample of a hydrate of nickel sulfate (NiSO4) lost 9.63g of water when heated. Determine the hydrate’s formula.

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