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    How to convert from mol% to wt%?

    so the concentration of molecule A is 0.5% mol. The rest of the molecules are water. This is calculated by (number of molecules of A / total number of molecules) x 100 More specifically, this is [20 / (20 + 3980)] x 100 We are given that the molecular weight of A is 136 g/mol. I have no idea...