Asked Oct 7, 2019

The elemental mass percent composition of ibuprofen is 75.69% C, 8.80% H, and 15.51% O. Determine the empirical formula of ibuprofen. Express your answer as a chemical formula. 


Expert Answer

Step 1

Given information:

Mass percent composition of carbon = 75.69  %

Mass percent composition of hydrogen = 8.80 %

Mass percent composition of oxygen = 15.51 %


Step 2

The representation of atoms of a compound in simple whole number ratio is known as empirical formula. The rules for determining empirical formula is given as follows:

  • Determine the mass of elements in given compound.
  • Calculate number of moles using molar mass of each compound or element.
  • Divide each number of moles by smallest number of mole value calculated in second step.
  • Round the value calculated in step 3 to nearest whole number.
Step 3

As, the elemental mass percent composition is given that means mass of carbo...

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