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### Finding Empirical and Molecular Formula

Posted: Sun Apr 15, 2018 8:53 pm
How do you find the empirical and molecular formula if the molecular structure is given? There was a whole section on it in the first chem exam.

### Re: Finding Empirical and Molecular Formula

Posted: Sun Apr 15, 2018 8:58 pm
Since the empirical and the molecular formula are the same, we look at the molecular structure to find the molecular formula since it shows the actual number of atoms and then to find the empirical formula we use the molecular formula. Then we divide the molecular formula by the highest common denominator and if there is none then the empirical and molecular formula should be the same.

### Re: Finding Empirical and Molecular Formula  [ENDORSED]

Posted: Sun Apr 15, 2018 9:01 pm
Count the atoms to get the molecular formula. The empricial formula is the simplified ratio!

### Re: Finding Empirical and Molecular Formula

Posted: Sun Apr 15, 2018 9:01 pm
I think you count how many of each atom you have for the molecular formula and then simplify that by it's least common denominator.

### Re: Finding Empirical and Molecular Formula

Posted: Sun Apr 15, 2018 9:06 pm
So if they are both the same and they can't be divided, they just remain the same?

### Re: Finding Empirical and Molecular Formula

Posted: Sun Apr 15, 2018 9:15 pm
If there are 2 lines showing a bond do you have to add 2 to both of the elements? Also should you look at the lines or at the number of elements?

### Re: Finding Empirical and Molecular Formula

Posted: Tue May 29, 2018 5:28 pm
You should look at the number of elements, not the bonds. Bonds are not for finding the empirical or molecular formula.