(Answered) What is the atomic mass of lead on the planet xygr if the

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What is the atomic mass of lead on the planet Xygr if the composition is 13.60 % Pb-206, 17.84 % Pb-207, 19.45% Pb 208 and the rest Pb-204? The masses are 205.974 ; 206.976 ; 207.977 and 203.973 amu, respectively. Enter the answer to three decimal places.

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