Oxygen is a mixture of two isotopes 16-O and 18-O with relative abundances of 90% and 10% respectively. The relative atomic mass of oxygen is?

OkunoyeShechina

1 year ago

The masses were given
O-16 meaning 16g/mol and O-18 meaning 18g/mol
So, you multiply the masses by their respective abundance i.e
[(16*90)+(18*10)]/100

Ikoifrancisusang

6 years ago

the atomic masses of the two isotopes were not given in the question