How to find number of moles removed

Question

I can't figure out how to find the number of moles removed from a volumetric flask to a erlenmeyer flask. I have a mass of 0.11g ascorbic acid (6.2*10^-5 moles) and the molarity is 6.2*10^-4. My friend says it's 6.25*10^-6 moles but I don't know how she got that or if it's right.

Answer 1

0.11 g ascorbic acid is NOT 6.2x10^-5 moles. The molar mass of ascorbic acid is 176 g/mole. Thus, if you have 0.11 g you have 0.11 g x 1 mole/176 g = 0.000625 moles = 6.25x10-4 moles, not x10^-5 moles.

Also, as in another question that you posted here, there isn't enough information. You want to know moles removed, but how many mls did you remove? And what is the volume of the volumetric flask?