There are four naturally occurring isotopes of iron, Fe-54, Fe-56, Fe-57, and Fe-58. The iron block on the periodic table gives an atomic mass of 55.845 amu. If one were able to pick out a single iron...

There are four naturally occurring isotopes of iron, Fe-54, Fe-56, Fe-57, and Fe-58. The iron block on the periodic table gives an atomic mass of 55.845 amu. If one were able to pick out a single iron atom at random, what is the probability that it will weigh 55.845 amu?

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It is true that there are four naturally occurring isotopes of iron: 5.845% of 54Fe, 91.754% of 56Fe, 2.119% of 57Fe and 0.282% of 58Fe.  However, the atomic mass listed for an element of the periodic table is not represented by any of these.  The atomic mass is a weighted average of all of the possible isotopes. 

The actual mass...

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