Which of the following has the least number of atoms?

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0.5 g atom of Zn

0.645g of Zn

0.25 mole of Zn

6.45 ×1020 amu of Zn

answer is D.

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Detailed Solution

1) 1 g atom of Zn atoms 0.5 g atom of Zn 2) 1 g atom of Zn (GAW = 64.5g) No atoms 0.645g of3) 1GAW of (1mole) = No atoms = 6.023 x 10234) 1 GAW of Zn (64.5g) = No atom 6.45 x 1020 amu of Zn = "X" at4th option contain least number of atom.

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