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A question for my PhysOrg course states:

Assume you are performing a reaction in which benzene is a reagent. What is the maximum concentration of benzene possible? Hint: what facts do you need to know to determine concentration?

I understand concentration is amount per volume in mol/L, but I'm not sure how to proceed from there.

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Sorry, I figured it out- just substitute mols for mass/MW and density for volume and rearrange until you get density/MW

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    $\begingroup$ You mean divide 876g/l by 78 g/mol, which gives you 11.2 mol/l. Jup. Water, for comparison, is 55.4 mol/l. $\endgroup$ – Karl Sep 8 '18 at 20:18

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