chemistry
posted by uci student .
What is the molarity of H3O+ in a 4.97×102 M NH4Cl solution that hydrolyzes according to the equation.
NH4+(aq) + H2O(l) = H3O+(aq) + NH3(aq)

You have the equation. Set up an ICE chart and calculate H3O^+.
You will need Ka for NH4^+ and it can be calculated from Ka = Kw/Kb where Kw = 1 x 10^14 and Kb = 1.8 x 10^5.