Answer: two
Explanation:
Oxidation Number of Nitrogen in NO2 (Nitrogen Dioxide) Nitrogen dioxide (NO2) is a molecule which contain two oxygen atom and one nitrogen atom.
answer=H+]=10-7
explain=the same way, a solution with a pH of 5 contains 10-5mol/l of hydrogen ions, a solution with a pH of 6 contains 10-6mol/l of hydrogen ions, while the solution with a pH of 7 contains 10-7mol/l of hydrogen ions
