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Calculate the atomic mass (average) of c...

Calculate the atomic mass (average) of chlorine using the following data:
`{:(,%" Natural Abundance", "Molar Mass "),(""^(35)Cl ,75.77 ,34.9689),( ""^(37)Cl ,24.23 ,36.9659 ):}`

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It is given two isotopes of bromine are 79/35Br(49.7%) and 81/35Br(50.3%). Then, the average atomic mass of bromine atom is given by
`79xx(49.7)/(100)+81xx(50.3)/(100)`
`=(3926.3)/(100)+(4074.3)/(100)`
`(8000.6)/(100)`
=80.006u
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