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One atom of an element x weight 6.643xx1...

One atom of an element `x` weight `6.643xx10^(-23)g`. Number of moles of atom in `20` kg is :

A

4

B

40

C

100

D

500

Text Solution

Verified by Experts

The correct Answer is:
4
Atomic weight of an element
`x=6.643xx10^(-23)xxN_(A)=40`
Number of moles of `x=(20xx1000)/(40)=500`
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