What is the [N3-] in a solution which is 0.1912 M in HN3 and 0.1643 M in HNO3?

[lion_sun93]

HN3(aq) + H2O(l) « N3-(aq) + H3? What is the [N3-] in a solution which is 0.1912 M in HN3 and 0.1643 M in HNO3?
HN3(aq) + H2O(l) « N3-(aq) + H3O+(aq)Ka = 1.9000e-5