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If one atom of an element A weighs 6.644...

If one atom of an element A weighs `6.644 xx 10^(-23)`,g then number of gram-atoms in 20 kg of it is

A

500

B

20

C

1000

D

2000

Text Solution

Verified by Experts

The correct Answer is:
A
Atomic weight of A
= weight of one atom `xx` Avogadro.s constant
`=6.644 xx 10^(-23) xx 6.023 xx 10^(23) = 40 g `
Number of gram-atoms (moles) in 20 kg
`=( " weight in g")/("atomic weight") = ( 20 xx 1000 )/( 40 ) =500`
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