Palladium-107 Undergoes $\beta$ Decay (T_1/2 = 6

Palladium-107 undergoes $\beta$ decay (t_1/2 = 6.5 *10⁵ yr) to form silver-107. How long will it take for 0.150 mol of silver-107 to form from 1.25 mol of palladium-107?

A) 2.0 *10⁷ y
B) 1.4 * 10⁷ y
C) 1.2 * 10⁶ y
D) 8.3 * 10⁵ y
E) 1.2 * 10⁵ y