We’re being asked to determine the molecular formula of cortisol given the mass percent of C, O 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.
Step 3: Get the ratio of the molar mass and empirical mass to determine the molecular formula.
Step 1: Recall that mass percent is given by:
Assuming we have 100 g of the compound, this means we have 69.6 g C, 8.34 g H, and 22.1 g O. Now, we need to get the moles of each element in the compound. The atomic masses are 12 g/mol C, 1 g/mol H, 16 g/mol O.
Cortisol (ℳ = 362.47 g/mol) is a steroid hormone involved in protein synthesis. Medically, it has a major use in reducing inflammation from rheumatoid arthritis. Cortisol is 69.6% C, 8.34% H, and 22.1% O by mass. What is its 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 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 Donovan's class at UAKRON.
What textbook is this problem found in?
Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.