Question

A new element -- quickly named Reachium by the scientific community -- is discovered. This element is found to have
two isotopes. 86.4% of all Reachium atoms are Reachium-328 and 13.6% are Reachium-333. What is the atomic mass of
this element?

Answer 1

(.864x328) + (.136x333)
283.392 + 45.288
=328.62g