If I understand correctly, you weighed a certain amount of solid 3-nitrophthalic acid at the beginning of the experiment. You can convert this amount to moles by dividing the mass in grams by the molecular weight (and multiplying by 1000 mmol/mol to convert to mmoles). Its density should not enter the picture at all. If it was a liquid and you measured its volume initially, then you would need the density to convert volume to grams and then to moles. But for solids, you don't need the density at all for converting to moles, since you would normally just weigh them on the balance and have the grams right from the get-go. Besides, the density of 3-nitrophthalic acid is not readily available; it's not in the CRC Handbook or on the Internet. I could not find it. If you needed it, it should have been provided with the experimental procedure, or at least be easier to obtain!  Steve |
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