(Solved): Cesium- 137 is part of the nuclear waste produced by uranium-235 fission. The half-life of cesium-1 ...

Cesium- 137 is part of the nuclear waste produced by uranium-235 fission. The half-life of cesium-137 is \( 30.2 \) years. How many milligrams of a \( 64.9 \) milligram sample of cesium-137 will be lost by radioactive decay during \( 90.6 \) years? \( \mathrm{mg} \)