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I solved this myself. I was using the wrong syntax. For example, to cite two references I would write:
\cite{ref1} \cite{ref2}
while I found the syntax that works to be:
\cite{ref1, ref2}

I am a fairly new user to LaTeX. I am currently writing my thesis and I am using the achemso style for my bibliography and a thesis class from my university.
I have encountered a strange problem. My intext references are not separated by commas. A friend of mine who is using the same bibliography ...