Posted by Jess on Wednesday, October 3, 2012 at 9:58pm.
A particular oral contraceptive contains 0.041 mg of ethinyl estradiol in each pill. The formula of this compound is C20H24O2. How many moles of ethinyl estradiol are there in one pill?
I need help in approaching this

Chemistry  GeorgeK, Wednesday, October 3, 2012 at 11:21pm
(1) Convert 0.041 milligrams to grams (divide by 1000)
(2) Find the formula mass of C20H24O2 to get the grams per mole.
(3) Divide the answer to step #1 by the grams/mole

Chemistry  Beth, Thursday, October 4, 2012 at 9:12pm
The other two parts are:
1) How many carbon atoms are there in one of these pills (due to the presence of ethinyl estradiol)?
2What mass of carbon is this? (Enter the answer in grams.)
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