Molecular Formulas

- If you know an empirical formula to find the molecular formula you need the molar mass.

Example :
-- The empirical formula for the substance CH2O and its molar mass is 60.0 g/mol . Determine the molecular formula.

                                                        EMPIRICAL                      MOLECULAR
                                                             CH2O             x2                  C2H4O2
M.M.=12.0+2(1.0) +16.0
         = 30.0                                       30.0g/mol           x2                  60.0g/mol


*watch this video to help you solve empirical and molecular formulas*

http://www.youtube.com/watch?v=AFqwtY7m2PI

Nicole H