Question

A blood sample has estradiol at a concentration of 1. 5*10^-9 M. What is the mass of estradiol found in 0. 5 L of blood

Answer 1

2.04*10^-7 grams

Step-by-step explanation:

The estradiol concentration of 1.5*10^-9 M can be rewritten as 1.5*10^-9 (moles/liter).

Lets now determine the moles of estradiol in 0.5 L of blood:

1.5*10^-9 (moles/liter)*(0.5L) = 0.75*10^-9 or 7.5*10^-10 moles.

Now we need the molar mass of the estradiol. The molecular formula is C18H24O2. I calculate a molar mass of 272.2 grams/mole. (18*12 + 24*1 +2*16 = 272)

Therefor: (7.5*10^-10 moles)*(272 grams/mole) = 2.04*10^-7 grams