The oxidation number of P in PO-3

What is the overall order of reaction for rate = k[no]2[o2]

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.

What is the value of keq for the reaction expressed in scientific notation?