Problem: An unknown substance has the composition of 74.97% C, 7.4% H and 17.6% O. The compound has a molar mass of 272.3 g/mole. What is the molecular formula?

FREE Expert Solution

We’re being asked to determine the molecular formula of a compound composed of C, H, and O given the mass percent of C and H. 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.

View Complete Written Solution
Problem Details

An unknown substance has the composition of 74.97% C, 7.4% H and 17.6% O. The compound has a molar mass of 272.3 g/mole. What is the molecular formula?

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 Empirical Formula concept. You can view video lessons to learn Empirical Formula. Or if you need more Empirical Formula practice, you can also practice Empirical Formula practice problems.