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Q.

The relative abundance of two isotopic forms of copper viz. $_{29}^{63} {Cu and}_{29}^{65} Cu$ are 70% and 30%, respectively. Calculate the average mass number of copper on the basis of given information.

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a

63.6

b

67.2

c

66.3

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 $_{29}^{63} Cu \to \frac{63 \times 70}{100} = 44.1$

$_{29}^{65} Cu \to \frac{65 \times 30}{100} = 19.5$

Average atomic mass of copper $= 44.1 + 19.5 = 63.6$

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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.