We’re being asked to determine the empirical formula of a compound composed of C, H, and O, given C 75.69%, H 8.80%, O 15.51%.
Recall that mass percent is given by:
Assuming we have 100 g of the compound, this means we have 75.69 g C, 8.80 g H, and 15.51 g O.
Now, we need to get the moles of each element in the compound.
The atomic masses are 12.01 g/mol C, 1.01 g/mol H, and 16 g/mol O.
= 6.30 mol C
= 8.71 mol H
= 0.97 mol O
Ibuprofen has the following mass percent composition:
C 75.69%, H 8.80%, O 15.51%.
What is the empirical formula of ibuprofen?
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