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Chemistry Forums for Students => Organic Chemistry Forum => Organic Spectroscopy => Topic started by: simonsci on August 01, 2015, 11:00:59 AM

Title: Using Rule of 13 to Find the Molecular Formula of a Compound
Post by: simonsci on August 01, 2015, 11:00:59 AM

Hello everyone! Please see the question below.

'Determine the molecular formula for each of the following:
...
d. an amide that has a molecular ion with an m/z value of 115' (From Organic Chemistry (7^th edition) by Bruice)

I worked out the question and my answer is C₆H₁₃NO. But the solution manual reads C₆H₁₂NO. Do anyone know how to do the question?

Title: Re: Using Rule of 13 to Find the Molecular Formula of a Compound
Post by: sjb on August 01, 2015, 03:29:36 PM

I think this may just be a typo. From the nitrogen rule you can see that the number of hydrogens must be odd.

Title: Re: Using Rule of 13 to Find the Molecular Formula of a Compound
Post by: MOTOBALL on August 03, 2015, 09:58:56 AM

Rule of 13 ???