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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