Question

This Chem problem is really difficult -Need help please!
Magnesium Consists of three naturally occuring isotopes. The percent abundance of these isotopes is as follows: 24Mg(78.70%), 25Mg(10.13%) and 26Mg(11.7%). The average atomic mass of the three isotopes is 24.3050amu. If the atomic mass of 25Mg is 24.98584 amu and 26Mg is 25.98259amu, calculate the actual atomic mass of 24Mg.
0.7870*y + (0.1013*(24.98584) + (0.117*(25.98259) = 24.3050
Solve for y
23.804
23.805 amu

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