The benzoate ion, C₆H₅COO-, is a weak base with Kb = 1.6 x 10⁻¹⁰ . How many moles of sodium benzoate are present in 0.50 L of a solution of NaC₆H₅OO if the pH is 9.04?
(a) 0.38
(b) 0.66
(c) 0.76
(d) 1.5
(e) 2.9