The ratio of the atoms of isotope-80 and isotope-100 are 6 to 5. What is the average atomic mass of the element?
The average mass is the element is 89 grams per mole.
There are 11 total parts in this ratio. So the total mass needs to be divided by 11.
6 parts are of isotope 80 so the mass of these parts is
5 parts are of isotope 100 so the mass of these parts is
The total mass units are the sum of the 11 parts.
480 + 500 = 980 mass units.
To find the average divide the total by 11