Question

Suppose that three isotopes of element X occur in nature as follows:

The relative atomic mass of the naturally occurring mixture of element X is

Answer 1

107.5 amu

Step-by-step explanation:

isotopes: fractional Wt Avg

isotopes: isotopic mass %Abundance abundance (amu)

X110 110 60 0.60 66.0

X105 105 30 0.30 31.5

X100 100 10 0.10 10.0

∑ atm mass contributions = 107.5 amu*

*amu = atomic mass units