I'm dissolving PCL in TFE for electrospinning purposes, and the paper I'm following has detailed how to do a 10% w solution by dissolving 0.4 g PCL in 4 mL TFE, but this doesn't seem right to me based on previous training I've received on how to calculate a w% solution which required me to dissolve 0.763 g PCL in 5 mL TFE. I'm feeling like the latter method is really a w/v%, but it always produced good results, so for future purposes which calculation should I go with?

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