## Empirical Formula

Leslie Contreras 1D
Posts: 35
Joined: Fri Apr 06, 2018 11:02 am

### Empirical Formula

The Molar mass is 84g.mol and its empirical Formula is CH2. What is its Molecular Formula?
I'm not sure how to start but I understand the process?
Attachments  KristinaNguyen_1A
Posts: 30
Joined: Fri Apr 06, 2018 11:04 am

### Re: Empirical Formula

I believe that since they give you the molar mass and the empirical formula, you will need to find the molar mass of the empirical formula:

C=12.01
H2=2(1.008)
CH2= 14.026

And then you find the ratio: 84g*mol^-1/14.026g*mol^-1

That will give you a value of 5.98888 so it is approximately 6

You will then multiply: 6(CH2) so you will end up with a molecular formula of C6H12

Jamie Reniva 1J
Posts: 14
Joined: Wed Nov 15, 2017 3:00 am

### Re: Empirical Formula

Since the empirical formula is given, you can find the molar mass of the empirical formula!
C=12.01
H=1.008 (since it's H2, you multiply 1.008 times 2)
Molar mass of CH2=14gCH2 (2 sig figs from the equation)

Always remember that you need to divide actual/theoretical
So our actual= 84g.mol^-1
theoretical= 14.026g.mol^-1
(84g.mol^-1)/(14.026g.mol^-1)= 6

Once we get the number by dividing actual to theoretical we multiply it to our empirical formula!

6(CH2)

So the molecular formula is C6H12