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Question
Explain fractional atomic mass. What is the fractional mass of chlorine?
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Solution
Atomic masses of the isotopes of chlorine are 35 and 37. However, in any given sample of chlorine gas, the isotopes occur in the approximate ratio 3:1, 75% of Cl35 and 25% of Cl37. So, the relative atomic mass or atomic weight of chlorine is 35.5.
Fractional atomic mass of chlorine
At. Mass = `(3(35) + 1(37))/2 = (105 + 37)/2`
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