Question

Uranium has 3 isotopes: 234 amu at 0.0057%, 235 amu at 0.72% and 238 amu at 99.27%. calculate the massatomic.,

Answer 1

1) We need to multiply each atomic mass by its relative abundance

`U\text{ (234) = 234 u}\cdot(0,0057)/(100)=0,013338\text{ u}`
`U\text{ (235) = 235 u}\cdot(0,72)/(100)=\text{ 1,692 u}`
`U\text{ (238) = 238 u}\cdot(99,27)/(100)=\text{ 236,2626 u}`

2) Add the values above

0,0133338 u + 1,692 u + 236,2626 u = 237,9679 u