In a sample of radioactive element

CHEMISTRY · Subjective · US High School · Chemistry · Atomic Structure & Nuclear · Atomic Structure & Nuclear

Problem

In a sample of radioactive element, radium disintegrates at an average rate of

2.24 \times 10^{13} \alpha\text{-particles per minute}

. Each

\alpha

-particle takes up 2 electrons from the air and becomes a neutral helium atom. After 420 days, the He gas collected was 0.5 mL measured at

27^\circ \text{C}

and 750 mm of mercury pressure. From the above data, calculate Avogadro's no.