**Tutorials**

- Determining the Molecular Weight of a Substance from its Formula
- The Mole and Molar Mass
- Calculating Grams Given the Moles of a Substance
- Calculating Moles Given Grams of a Substance
- Avogadro Number Calculations I - Calculating the Mass of One Molecule
- Avogadro Number Calculations II - How Many Atoms or Molecules? (10)
- How to Calculate an Average Atomic Weight
- Calculating Isotopic Abundances Given the Average Atomic Weight
- Percent Composition
- Empirical Formula
- Determining Empirical Formulas by Combustion Analysis (10)
- Determining Molecular Formulas from Empirical Formulas

**Problem Sets**

- Worksheet - Molar Mass, Answers
- 28 of the above worksheet problems in an HTML file, Handwritten solutions
- Some Bonus Empirical Formula Problems
- Determine empirical formula from percent composition data
- Determine empirical formula from mass data
- Determine identity of an element from a binary formula and a percent composition
- Determine identity of an element from a binary formula and mass data
- Determine the formula of a hydrate (10) (15)

**Videos**

- Converting Between Moles and Mass I
- Calculate mass of a sample with same number of atoms as a second sample
- How to Calculate an Average Atomic Weight
- How to Determine Percent Abundances
- Determine an isotopic weight from percent abundances
- Determine an atomic weight from mass and formula data
- Calculate an empirical formula I
- Calculate an empirical formula II
- Determine the molecular formula
- Determine the water of hydration for sodium carbonate
- Calculate an atomic weight using mass data of several compounds

**Videos which use Avogadro's Number**

- Calculating a value for the Avogadro Constant
- An illustration of the size of Avogadro's Number
- Given 14.05 g of SO
_{2}, how many molecules is this? - Given 4.91 x 10
^{22}formula units of CuSO_{4}, how many grams is this? - What is the mass, in milligrams, of 19 atoms of nickel?
- How many total atoms are in 27.2 g of SF
_{6}? - How many oygen atoms in 4.64 x 10
^{-3}mol of Al(NO_{3})_{3}? - How many atoms of hydrogen are in 100 g of methane?
- Determine number of atoms using volume and density
- Using Avogadro's Number coupled with the Ideal Gas law

**Links**

- Two (of many) on-line molecular weight calculators:

**Miscellaneous**