Practice: Cortisol (MW = 362.47 g/mol), a known steroid hormone, is found to contain 69.6% carbon, 8.34% hydrogen, and 22.1% oxygen by mass. What is its molecular formula?
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| Empirical Formula | 14 mins | 0 completed | Learn Summary |
| Molecular Formula | 18 mins | 0 completed | Learn |
| Combustion Analysis | 39 mins | 0 completed | Learn |
| Combustion Apparatus | 9 mins | 0 completed | Learn |
| Polyatomic Ions | 25 mins | 0 completed | Learn Summary |
| Naming Ionic Compounds | 11 mins | 0 completed | Learn |
| Writing Ionic Compounds | 7 mins | 0 completed | Learn |
| Naming Ionic Hydrates | 6 mins | 0 completed | Learn |
| Naming Acids | 18 mins | 0 completed | Learn |
| Naming Molecular Compounds | 6 mins | 0 completed | Learn |
| Balancing Chemical Equations | 15 mins | 0 completed | Learn |
| Stoichiometry | 23 mins | 0 completed | Learn Summary |
| Limiting Reagent | 16 mins | 0 completed | Learn Summary |
| Percent Yield | 16 mins | 0 completed | Learn Summary |
| Mass Percent | 4 mins | 0 completed | Learn Summary |
| Functional Groups in Chemistry | 11 mins | 0 completed | Learn |
The molecular formula gives the actual number of atoms.
Molecular Formula
Concept #1: Molecular Formula
Example #1: After a workout session, lactic acid (M = 90.08 g/mol) forms in muscle tissue and is responsible for muscle soreness. Elemental analysis shows that this compound contains 40% C, 6.7% H and 53.3% O. Determine the molecular formula.
Practice: Elemental analysis of a pure compound indicated that the compound had 72.2% C, 8.50% H and the remainder as O. If 0.250 moles of the compound weighs 41.55 g, what is the molecular formula of the compound?
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