Which one of the following will have largest number of atoms? (i) 1 g Au (s) (ii) 1 g Na (s) (iii) 1 g Li (s) (iv) 1 g ofCl2(g)(Atomic masses: Au = 197, Na = 23, Li = 7, Cl = 35.5 amu)

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It's 1g of Li
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Li has least atomic mass hence
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Li
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