# 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?

##### 1 Answer

Apr 10, 2017

Divide the empirical formula into the the molecular mass to find the number n and then put n into the chemical formula

#### Explanation:

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

1

We now define the mass if n=1

1x

2x

1 x

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