1.

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

Answer»

`3.01 XX 10^22`
`2.408 xx 10^23`
`6.02 xx 10^23`
`0.4`

Solution :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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