# Problem: Ibuprofen has the following mass percent composition:C 75.69%, H 8.80%, O 15.51%.What is the empirical formula of ibuprofen?

###### FREE Expert Solution

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

92% (415 ratings) ###### Problem Details

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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