# Problem: Determine the empirical and molecular formulas of each of the following substances. For example, butane has an empirical formula of C2H5 (lowest whole-number ratio) and a molecular formula of C4H10, where the molecular formula corresponds to the molar mass of 58.12 g/mol.Ibuprofen, a headache remedy, contains 75.69% C, 8.80%  H, and 15.51%  O by mass and has a molar mass of 206 g/mol.

###### FREE Expert Solution

Step 1: We are given 75.69% C, 8.80%  H, and 15.51% O by mass.

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.

85% (181 ratings) ###### Problem Details

Determine the empirical and molecular formulas of each of the following substances. For example, butane has an empirical formula of C2H5 (lowest whole-number ratio) and a molecular formula of C4H10, where the molecular formula corresponds to the molar mass of 58.12 g/mol.

Ibuprofen, a headache remedy, contains 75.69% C, 8.80%  H, and 15.51%  O by mass and has a molar mass of 206 g/mol.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Molecular Formula concept. You can view video lessons to learn Molecular Formula. Or if you need more Molecular Formula practice, you can also practice Molecular Formula practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Bursten's class at Worcester Polytechnic Institute.