A solution is prepared by mixing 250 ml toluene (C7H8) and 8.4 g thiophene(C4H4S). Then molality of thiophene in the solution is : [Given : Density of toluene = 0.8 g/ml, Density of thiophene = 1.2 g/ml] [Multiply your answer by 10]

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Question

A solution is prepared by mixing 250 ml toluene (C₇H₈) and 8.4 g thiophene(C₄H₄S). Then molality of thiophene in the solution is :

[Given : Density of toluene = 0.8 g/ml, Density of thiophene = 1.2 g/ml]

[Multiply your answer by 10]

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$m = \frac{(\frac{8 .4}{84})}{(250 \times 0 .8)} \times 1000 = \frac{8 .4}{84} \times \frac{4}{0 .8} = 0 .5$