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The vapour pressure of CS(2) at 50^(@)C ...

The vapour pressure of `CS_(2)` at `50^(@)C` is `854 "torr"` and a solution of `2.0 g` sulphur in `100 g` of `CS_(2)` has vapour pressure `848.9 "torr"`. If the formula of sulphur molecule is `S_(n)`, then calculate the value of `n`. (at mass of `S = 32`).

Text Solution

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`P_A^0=854 "torr" , (DeltaP)/(P_A^0)=(854-848.9)/(854)=chi_B= 5.97 xx10^(-3)=(n_B)/(n_A+n_B)=(2//M_B)/(2//M_B+100//76) rArr M_B= 254.6 gm//mol`
`rArr underset(("No of satoms"))"Formula" =(254.6)/(32)~~8 rArr S_8`
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