NEET Class neet Answered
In 100 g of naphthalene , 2.423 g of S was dissolved . Melting point of naphthalene is 80.1 celcius .Tf is 661 celcius . Lf is 35.7 cal/g of naphthalene . Molecular formula of sulphur added is
(a)S2
(b)S4
(c)S6
(d)S8
Asked by Balbir | 17 Jul, 2019, 04:48: PM
Expert Answer
Given:
Melting point of napthalene Tf = 80.1ºC = 353K
Lf = 35.7 cal/g
WA = 0.661
WB = 2.423g
Formula used:
And the formula for depression in freezing point,
Since, the atomic weight of sulphur is 32 and its molecular mass is 256, therefore number of sulphur atoms associated to form a single molecule is 
Hence the molecular formula of sulphur is S8
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