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One atom of an element x weigh `6.643 xx 10^(-23)` g. Number of moles of atom in 20 kg is :-

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One atom of an element x weigh `6.643 xx 10^(-23)` g. Number of moles of atom in 20 kg is :-
A. 4
B. 40
C. 100
D. 500
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Correct Answer - A
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