Polonium-210, a naturally occurring radioisotope, is an a emitter, with t1/2 = 138 d.
Assume that a sample of 210Po with a mass of 1.000 mg was placed in
a 50.0 ml vessel,
which was evacuated, sealed, and allowed to sit undisturbed. What would the pressure be
inside the vessel (in mm Hg) at 22 °C after two years if all the a particles emitted had become helium atoms?
