How can I identify the molecular fomula, based on an m/z of 350.7897?

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To identify the molecular formula based on an m/z of 350.7897, utilize tools like www.chemcalc.org to explore potential structures. Analyze the mass spectrum, focusing on the highest mass ion and the differences between peaks to deduce possible atom groups. Consider the nitrogen rule and fragmentation patterns to align with the other m/z values. Repeat this process for various fragment losses to construct the molecular structure. This systematic approach will help clarify the molecular formula.
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Thread moved from the technical forums to the schoolwork forums
TL;DR Summary: I have the aforementioned m/z and a mass spec graph, my lecturer completely glossed over how to find the molecular formula so I'm stumped.

I have a mass spec with 4 peaks and the m/z value, how can I find the molecular formula.
 
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You have a very exact mass. Use www.chemcalc.org to find possible structures. Remember the nitrogen rule. Deduce possible structures and look if their fragmentation patterns fit the other m/z tops.
 
What do you think the highest mass ion represents (in most examples for students to solve, that is).
What do you think the difference between two peaks represents?
What group of atoms could that be?
Repeat for several of the fragment losses.
Build the molecule.
 
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