The ratio of the atoms of isotope-80 and isotope-100 are 6 to 5. What is the average atomic mass of the element?

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Answer 1 · 2016-09-25T03:11:07

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

$6 \times 80$ $6 xx80$ = 480 mass units.

5 parts are of isotope 100 so the mass of these parts is

$5 \times 100$ $5 xx 100$ = 500 mass units.

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

$\frac{980}{11}$ $980/11$ = 89