How do you calculate the average atomic mass of lead?

Naturally occurring lead exists as four stable isotopes: 204Pb with a mass of 203.973 amu (1.480%); 206Pb, 205.9745 amu (23.60%); 207Pb, 206.9759 amu (22.60%); and 208Pb, 207.9766 amu (52.30%). Calculate the average atomic mass of lead.

Answer:
Multiply the amu of each isotope with its weighted percentage and add the numbers.

(203.973 x 1.48 + 205.9745 x 23.6 + 206.9759 x 22.6 + 207.9766 x 52.3) / 100 = 207.1770976 = 207.1771
2nd way:
(203.973*0.0148)+(205.9745*0.2... = 207.1770976

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