A sample of pitch blende is found to contain 50% uranium and 2.425% lead

CHEMISTRY · Subjective · AP · Chemistry · Atomic Structure and Properties · Atomic Structure and Properties

Problem

A sample of pitch blende is found to contain 50% uranium and 2.425% lead. Of this lead only 93% was

\text{Pb}^{206}

isotope. If the disintegration constant is

1.52 \times 10^{-10} \text{ yr}^{-1}

, how old could be the pitch blende deposits?