What Is the [H₃O⁺] in a Solution That Consists of 1.5

Multiple Choice

What is the [H₃O⁺] in a solution that consists of 1.5 M NH₃ and 2.5 NH₄Cl? K_b = 1.8 × 10^-5

A) 1.1 × 10^-5 M
B) 3.0 × 10^-6 M
C) 3.3 × 10^-9 M
D) 9.3 × 10^-10 M
E) None of these choices are correct.