Section 2: Formula

MassChapter 7: Chemical Composition

Learning Goals0Calculate formula mass.

Formula Mass0For any compound, the formula mass is the sum of the atomic masses of all the atoms in its chemical formula:

Formula Mass0Like the atomic mass for atoms,

formula mass characterizes the average mass of a molecule or formula unit.

0H2O:0Formula mass = 2(1.01 amu) + 16.00 amu

= 18.02 amu

Formula Mass0What is the formula mass of carbon tetrachloride?

0What is the formula mass of dinitrogen monoxide?