Are atomic mass, formula mass, and molar mass the same thing?
Formula mass and molar mass are the same. Atomic mass refers to atomic particles.
When we write "formula mass", we usually mean the mass associated with 1 mole of such a formula; i.e. Avogadro's number of such a formula. Molar mass is the same thing: Avogadro's number of whatever stuff you have. The ability to successfully calculate equivalent masses of compounds is vital to success in Chemistry.
PS Atomic mass is the mass associated with a mole of atomic species; this is not always the same as olar mass: a mole of