1.

The vapour pressure of CS_(2) at 50^(@)C is 854 torr and a solution of 2.0 gm sulphur in 100 gm of CS_(2) has vapour pressure 848.9 torr. If the formula of sulphur molecule is S_(n) , then calculate the value of "n" (approx) (At mass of S = 32):- (fill nearest integer value) [Assume very dilute solution].

Answer»


SOLUTION :(For very DILUTE solution)
`(mol. Wt)_("solute") = 254.5`
mol. Wt of `S_(n) = 32 xx n`
`32 xx n = 254.5`
`n = 7.95`
`= 8`.


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