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CBSE Class 11-science Answered

what is the molality of aqeous solution of benzene having mole fraction 0.6?  
Asked by babetadhawan742 | 11 Jun, 2018, 11:51: AM
answered-by-expert Expert Answer
Given:
 
Mole fraction = 0.2
 
So comma space in space 100 space moles comma space there space sre space 20 space moles space of space solute space and space 80 space moles space of space solvent Mass space of space benzene space equals space 80 Molecular space weight space of space benzene space equals space 80 cross times 78 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 space space space space space space space equals space 6240 space straight g therefore space 20 space moles space of space solute space for space 6240 space straight g space of space solvent comma therefore space for space 1000 space straight g space of space solvent space equals space fraction numerator 1000 cross times 20 over denominator 6240 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 equals 3.2 space molal
 
Molality of aqeous solution of benzene is 3.2 molal.

Answered by Varsha | 11 Jun, 2018, 02:15: PM

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