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Question

Calculate the difference in the number of carbon atoms in 1.0 g of C14 isotope and 1.0 g of C12 isotope.

A
7.2×1021
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B
6.2×1020
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C
6.2×1022
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D
7.2×1020
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Solution

The correct option is A 7.2×1021
1 gram carbon C12 isotope contain 1/12×6.023×1023 atoms
1 gram carbon C14 isotope contain 1/14×6.023×1023 atoms
difference of atoms in C12 and C14 =6.023×1023(1/121/14)
=0.011×6.023×1023
=7.17×1021 or 7.2×1021

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