Atomic mass: the average mass of the subatomic particles (protons, neutrons, [electrons don't have enough mass]) that make up an atom
-abreviations: amu, daltons, and u


Formula Mass: the sum of atomic masses of all the atoms in a formula of an ionic compound
Eg.) BeS= 9.0amu + 32.1amu = 41amu (s.f.)

Try the following questions: Calculate the formula mass.
1) NaCl
2) Magnesium Fluoride
3) Li2SO4
4) Copper(ii) nitrate

Molecular Mass: the sum of the atomic masses of all the atoms in a formula of a covalent compound
-think molecular = molecule = covalent compound
Eg.) CN= 12.0amu + 14.0amu = 26.0amu

Try the following questions: Calculate the molecular mass.
1)CO2
2)Chlorine gas
3)ClO3
4)Carbon tetrafluoride

Molar Mass: the mass of 1 mole of an element
-every element has a different molar mass due to the mass of particles in the nucleus
-molar mass is always measuring the mass of 6.022 x 10^23 atoms
-measured in grams/mole (g/mol)
-atomic mass of an element = molar mass of the same element in g/mol
The molar mass is 9.01g/mol.

Try the following problems: State the molar mass.
1)Vanadium
2)Bromine
Determine the element that has a molar mass of:
1)27.0g/mol
2)83.8g/mol