10 g-atoms of an -active radioactive isotope are disintegrating in a sealed container

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

Problem

10 g-atoms of an

\alpha

-active radioactive isotope are disintegrating in a sealed container. In one hour, the He gas collected at STP is

11.2 \text{ cm}^3

. Calculate half-life of the radioactive isotope.