CBSE Class 12-science Answered

An aqueous solution of CUSO4 has molality 1.5m. What are the mole fractions of the solute and the solvent?

Asked by lekhakarthikeyan | 29 Aug, 2018, 12:50: PM

Expert Answer

Given:

Molality of CuSO₄ solution = 1.5 m

Molality space equals fraction numerator No. of space moles space of space CuSO subscript 4 over denominator weight space of space solvent space in space Kg end fraction No. of space moles space of space CuSO subscript 4 space equals 1.5 space moles space in space 1 space kg space of space solvent No. space of space moles space of space straight H subscript 2 straight O space equals 1000 over 18 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 55.56 space moles Mole space fraction space of space space CuSO subscript 4 space equals fraction numerator No. of space moles space of space CuSO subscript 4 over denominator No. of space moles space of space CuSO subscript 4 space plus No. space of space moles space of space straight H subscript 2 straight O end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space fraction numerator 1.5 over denominator 55.56 plus 1.5 end fraction Mole space fraction space of space space CuSO subscript 4 space equals space 0.026 Mole space fraction space of space straight H subscript 2 straight O space equals space fraction numerator No. space of space moles space of space straight H subscript 2 straight O over denominator No. of space moles space of space CuSO subscript 4 space plus No. space of space moles space of space straight H subscript 2 straight O end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals fraction numerator 55.56 over denominator 1.5 plus 55.56 end fraction Mole space fraction space of space straight H subscript 2 straight O space equals space space 0.9738

Answered by Varsha | 29 Aug, 2018, 01:21: PM

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