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How many molecules of sulphur are presen...

How many molecules of sulphur are present in 12.8 g of sulphur (atomic mass of S = 32) ?

A

`3.01 xx 10^22`

B

`2.408 xx 10^23`

C

`6.02 xx 10^23`

D

`0.4`

Text Solution

Verified by Experts

The correct Answer is:
A
No. of atoms of sulphur in 12.8 g
` = (6.02 xx 10^23)/(32) xx 12.8`
One of mulecules of sulphur contains 8 atoms ` = (S_8)`
` therefore ` No. of `S_8` molecules
` = (6.02 xx 10^23 xx 12.8)/(32 xx 8) = 3.01 xx 10^22`
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