3. How many atoms are in 85 moles H2O?​

5.119 *10^25

Explanation:

1 mole = 6.022 * 10^23

the moles cancel out so you get

85 * (6.022*10^23)

Plug that into the calculator so you get:

5.119 *10^25

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.