Calculate the pH of a solution prepared by dissolving 0.850 mol of NH₃ and 0.350 mol of NH₄Cl in water sufficient to yield 1.00 L of solution. The Kb of ammonia is 1.77 x 10^-5.
a). 5.137
b). 4.367
c). 9.633
d). 8.781
e). 8.863