Chemistry

Problem

The mass numbers of three isotopes of an element are 11, 12, 13 units. Their percentage abundance is 80, 15, and 5 respectively. What is the atomic weight of the element? 1) 10.25 2) 11.25 3) 12.25 4) 13.25 1) 10.25 2) 11.25 3) 12.25 4) 13.25

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