Silicon is found in many compounds in the Earth's crust. Silicon has only three naturally
occurring isotopes, 28Si, 29Si and 30Si.
(i) The table shows data for 28Si, 29Si and 30Si.
28Si isotopic mass=28.0
29Si isotopic mass=29.0
30Si isotopic mass=30.0
A sample of silicon contains 92.2% 28Si.
The total percentage abundance of 29Si and 30Si in the sample is 7.8%.
The relative atomic mass, Ar, of silicon in the sample is 28.09.
Calculate the percentage abundance of 30Si.
Give your answer to one decimal place.