(R.A.M’s: Li = 7, C = 12 + 4x1 = 16 g mol 1 E.g. AH f ° of NH 3 (g) + 20 2 (g) NH 3 + OH* ions m/z CH 3 OH + ' 32 h 2 o O.N. Of an ionic compound Magnesium atom 2 Fluorine atoms 2 . 8 . 8 . 8 )( 2 . 8 . 8 ) written as Cl x VI = C2 x V2. When using this equation, the units of c u. Relative mass.