Can anyone help me answer this question? For some reason I'm really stuck on it:
A sample of Strontium is made up of only three isotopes: 86Sr, 87Sr and 88Sr.
This sample contains 83% by mass of 88Sr
This sample of strontium has Ar = 87.73
Calculate the percentage abundance of each of the other two isotopes in the sample.
I've tried doing a normal percentage abundance calculation (ie percentage x mass number for each isotope/100) but can't work out how you find out the ratio of each isotope.
Thanks!