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

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We’re being asked to determine the empirical formula of ibuprofen, a compound composed of C, H, and O given the mass percent of C, H, and O. This means we need to do the following steps:


Step 1: Calculate the mass and moles of C, H, and O in the compound.

Step 2: Determine the lowest whole number ratio of C, H, and O to get the empirical formula.

Step 1: The compound is composed of C, H, O we’re given the mass percent of C (75.69% C), H (8.80% H) and O (15.51 % O). 

Recall that mass percent is given by:

Mass % = mass of elementtotal mass of compound×100%


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

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Problem Details

Ibuprofen has the following mass percent composition. What is the empirical formula of ibuprofen?

C: 75.69%

H: 8.80%

O: 15.51%

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