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Q.

One atom of an element x weighs 6.643 x 10-23 g. Number of moles of atom in 20 kg is:

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a

100

b

40

c

4

d

500

answer is D.

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Detailed Solution

Atomic weight of an element
x =6.643 x 10-23 x NA = 40
no. of moles of x=20×100040=500

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