Question

If you had a mixture of benzene, toluene, and m-xylene, what would be the expected order of retention times? Explain.

I know benzene would have a retention time of 3 mins, toluene about 4.8 mins, and m-xylene about 5.6 mins, right? Therefore, the expected order of retention times would be benzene with the lowest and m-xylene with the highest retention time. However, I do not know how to explin this. Please Help!
What about molar mass?

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