a)A particular oral contraceptive contains 0.038 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 got tjis first part, the answer is 1.282e-07 mol
b)How many hydrogen atoms are there in one of these pills (due to the presence of ethinyl estradiol)?
c)What mass of hydrogen is this?
I can't figure out how to solve the rest
2007-02-04 04:52:04 · 2 answers · asked by bollocks 2 in Science & Mathematics ➔ Chemistry
You did the hardest part, the math in part a. The rest is just conceptual. There are 24 atoms of H per molecule of the ethinyl estradiol, and therefore it follows that there are 24 times as many moles of hydrogen as there are the estradiol, just as there are two moles of oxygen atoms per mole of water molecules. The third part is to just multiply the atomic mass by the number of moles of hydrogen that we just found in part b. The atomic mass of hydrogen is listed as 1.00794 g/mol in my book, so just multiply this number by the number of moles from part b to find the mass of the hydrogen atoms.
b) 24 * (1.282*10^-7 mol) = # of moles of H
c) (1.00794 g/mol) * # of moles of H = mass of H
Good luck!
2007-02-09 21:47:50 · answer #1 · answered by Greg Z 3 · 0⤊ 0⤋
you tell me
2007-02-04 05:02:38 · answer #2 · answered by Tigerluvr 6 · 0⤊ 1⤋