Remember there are two main types of nuclear chemistry problems: how
much and how long.
1) If the half-life of 14056Ba is 12.75 days, how many
atoms of 14056Ba will be left after
9 weeks if there were initially 2.4 mol of atoms?
2) How long will it take 3.8 x 1024 atoms of 10047Ag
to disintegrate to 2.93 x 1023 atoms
if the half life of 10047Ag is
3) Radioactive copper, 6429Cu, is found in quantities
exceeding pollution standards in the
sediments of a reservoir in a routine check on Monday.
The standard allows up to
14 ppm/cubic meter of sediment. On Monday, 59ppm/cubic
meter were measured.
The half life of 6429Cu is 12.7
hours. When will the pollution level return to 14ppm?
4) An unidentified corpse was discovered on 21 April at 7:00 AM. The
discovered that there were 1.24 x 1037 atoms of 3215P
remaining in the victim's bones
and placed time of death sometime on 15 March. The half
life of 3215P is 14.28 days.
How much 3215P was present in the bones
at the time of death?