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Q.

A hypothetical element Z exists in nature as two isotopes 65Z and 67Z with their relative abundances 25% and 75% respectively. Then, the average atomic mass (in u) of element Z is :

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a

65.5

b

66

c

65.25

d

66.5

answer is D.

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Detailed Solution

65×14+67×34100=66.5

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