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Q.

The relative abundance of two isotopic forms of copper viz.  2963Cu  and 2965Cu  are 70% and 30%, respectively. Calculate the average mass number of copper on the basis of given information.

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a

66.3

b

67.2

c

63.6

d

65.5

answer is C.

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Detailed Solution

Based on the average atomic mass of isotopes of copper the mass number of copper is calculated.

For  2963Cu→63×70100=44.1

 2965Cu→65×30100=19.5

Average atomic mass of copper  =44.1+19.5=63.6

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