Posted by Marty on Saturday, October 20, 2007 at 9:47am.
You need the mass of the 36, 38, and 40 isotopes to calculate the atomic mass but since the problem says to estimate, I assume you are to use the mass numbers. The estimated atomic mass calculated this way gives a value that is too high from the actual value.
(36*0.0034) + (38*0.0006) + (40*0.9966) = ??
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