How many moles are in 2.1 x 10^25 molecules of sucrose? Round to the 2nd decimal place.

The answer among the choices given is option A. The concentration of OH- in pure water is 1.00 x 10^-7 M. This due to the self-ionization of water into hydroxide ions (OH-) as the base and hydronium ion (H+) as the acid. The concetration of H+ is the same for the OH- resulting to a neutral pH.