Paige W.

asked • 08/24/20

The isotopes of oxygen have the following relative abundances: O-16 (99.759%); O-17 (0.037%) and O-18 (0.204%). Solve for the average atomic mass of oxygen




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Mike D. answered • 08/24/20

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Paige


You need the atomic masses of the three isotopes here (they are missing).


If the atomic masses are O16, O17 and O18 the average atomic mass will be


0.99759 x O16 + 0.00037 x O17 + 0.00204 x O18 [I have converted the % to decimals by dividing by 100 ]


Mike

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