How many grams of pyridine are there in 100 mL of an aqueous solution that has a pH of 9? The K_b for pyridine is 1.9 × 10⁻⁹ and the molar mass of pyridine is 79.102 \, {g/mol}.
a) 0.15 grams
b) 0.26 grams
c) 0.34 grams
d) 0.41 grams