Tutorials and Problem Sets

Tutorials

1. Determining the Molecular Weight of a Substance from its Formula
2. The Mole and Molar Mass
3. Calculating Grams Given the Moles of a Substance
4. Calculating Moles Given Grams of a Substance
5. Avogadro Number Calculations I - Calculating the Mass of One Molecule
6. Avogadro Number Calculations II - How Many Atoms or Molecules?
7. How to Calculate an Average Atomic Weight
8. Calculating Isotopic Abundances Given the Average Atomic Weight
9. Percent Composition
10. Empirical Formula
11. Determining Empirical Formulas by Combustion Analysis (10 problems) (10 more problems)
12. Determining Molecular Formulas from Empirical Formulas

Problem Sets

1. Worksheet - Molar Mass, Answers
2. 28 of the above worksheet problems in an HTML file, Handwritten solutions
3. Some Bonus Empirical Formula Problems
4. Go to problems 11 - 20 of combustion analysis
5. Determine empirical formula from percent composition data
6. Determine empirical formula from mass data
7. Determine identity of an element from a binary formula and a percent composition
8. Determine identity of an element from a binary formula and mass data
9. Determine the formula of a hydrate

Other Resources

Videos

1. How to Calculate the Molar Mass
2. Converting Between Moles and Mass I
3. Calculate mass of a sample with same number of atoms as a second sample
4. How to Calculate an Average Atomic Weight
5. How to Determine Percent Abundances
6. Determine an isotopic weight from percent abundances
7. Determine an atomic weight from mass and formula data
8. Calculate the percent of Cl in Al(ClO₃)₃
9. Calculate an empirical formula I
10. Calculate an empirical formula II
11. Calculate an empirical formula III
12. Calculate an empirical formula IV
13. Determine the empirical formula using combustion analysis
14. Combustion Analysis: Part One of Two
15. Combustion Analysis: Part Two of Two
16. Determine the molecular formula I
17. Determine the molecular formula II
18. Determine the water of hydration for sodium carbonate
19. Calculate an atomic weight using mass data of several compounds

Videos which use Avogadro's Number

1. How to Convert Between Number of Molecules and Moles I
2. Calculating a value for the Avogadro Constant
3. An illustration of the size of Avogadro's Number
4. Given 14.05 g of SO₂, how many molecules is this?
5. Given 4.91 x 10²² formula units of CuSO₄, how many grams is this?
6. What is the mass, in milligrams, of 19 atoms of nickel?
7. How many total atoms are in 27.2 g of SF₆?
8. How many oygen atoms in 4.64 x 10^-3 mol of Al(NO₃)₃?
9. How many atoms of hydrogen are in 100 g of methane?
10. Determine number of atoms using volume and density
11. Using Avogadro's Number coupled with the Ideal Gas law

Links

1. Some on-line molecular weight calculators:
   • A scientific calculator with molecular weight calculator built-in
   • A no-frills calculator with does only molecular weight.
   • A molecular weight calculator set up as a list of elements in alphabetical order

Miscellaneous

1. Some Avogadro Number Analogies
2. Origin of the word "mole"