A particular oral contraceptive contains 0.025 mg of ethinyl estradiol in each pill.?
The formula of this compound is C20H24O2. How many molecules of ethinyl estradiol are there in one pill? (give answer to 3 digits)
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C + H + O
(12*20) + (24) + (16*2)
240 + 24 + 32
296
(2.5 * 10^-5) / 296
8.446 moles
8.446 * Avogadro's no. (6.02 * 10^23)
5.084molecules
hope this helps ^_^