Question

The element europium exists in nature as two isotopes: 151^Eu has a mass of 150.9196 amu, and 153^Eu has a mass of 152.9209 amu. The average atomic mass of europium is 151.96 amu. Calculate the relative abundance of the two europium isotopes.
x = fraction abundance 151 Eu
1-x = fraction abundance Eu153.

150.9196(x) + 152.9209(1-x) = 151.96.
Solve for x.
You may convert the fractions to percentages by multiplying each by 100.
thank you Dr Bob!
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