When water ionizes, it produces equal amounts of hydrogen and hydroxide ions that can reassociation with each other. The pH of water is:

Explanation:

ionic product of water Kw = 10⁻¹⁴

[H⁺] [  OH⁻ ] = 10⁻¹⁴

[H⁺] ² = 10⁻¹⁴

[H⁺] = 10⁻⁷

Water dissociates as follows .

H₂O     ⇄     H⁺      +     OH⁻

                  10⁻⁷M       10⁻⁷ M

pH = - log [H⁺]

= - log [  10⁻⁷ ]

= 7 .

So pH of pure water solution = 7 .

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)

the answer is a for sure mark brainliest i had got this right on usatestprep