How many molecules are in 4.00 x 10^2mg of ibuprofen?

Question

Chemistry

Norah Bradshaw

6 October, 22:37

How many molecules are in 4.00 x 10^2mg of ibuprofen?

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Greyson · Answer 1

Start by converting mg to g. There is. 001g in every miligram, so there is 0.4g in this sample.

Then find the molar mass of ibuprofen (C13H18O2) which is 206.3g/mol

Then divide grams by the molar mass to get moles of C13H18O2: (0.4g) / (206.3g/mol) = 1.94x10^-3mol C13H18O2

Then multiply moles by Avogadro's number to get molecules: (1.94x10^-3mol) / (6.02x10^23) = 1.17x10^21 molecules of ibuprofen (C13H18O2)