How do I get the Molecular Formula from % Composition?
Monday, August 30th, 2010 at
9:34 am
Cortisol (M = 362.47 g/mol), one of the major steroid hormones, is a key factor in the synthesis of protein. Its profound effect on the reduction of inflammation explains its use in the treatment of rheumatoid arthritis.
Cortisol is 69.6% C, 8.34% H, and 22.1% O by mass. What is its molecular formula?
Answer is: C21H30O5
How do I arrive at that answer?
Tagged with: Composition • Formula • from • Molecular
Filed under: Rheumatoid Arthritis Treatment
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Let UNITs guide you; always USE THEM in your calculation to prevent errors
moles C/362.47g = 0.696 * 362.47g /12 g/mole = ??
moles H/362.47g = 0.0834 * 362.47g /1 g/mole = ?? = 30.2
moles O/362.47g = 0.221 * 362.47g /12 g/mole = ??
round to whole numbers
SOLVE
Basic mathematics is a prerequisite to chemistry – I just try to help you with the methodology of solving the problem.