How do you calculate the molecular formula of a compound with the empirical formula #C_n H_(2n) O# and a molar mass of 150 g/mol?
Divide the empirical formula into the the molecular mass to find the number n and then put n into the chemical formula
It would help if there was an n under the O but assume the formula has an n under the O the empirical formula has the ratio of
We now define the mass if n=1
Adding them all together gives the mass per n=1
12 + 2 + 16 = 30 g/mol
Divide 150 g/mol by 30 g/mol to find the number of empirical units (which is n).
So we get n = 5, putting this back into the formula gives the solution