11th Class Chemistry Some Basic Concepts of Chemistry

  • question_answer 37) Calculate the molality of a solution of ethanol in water in which the mole fraction of ethanol is 0.04.

    Answer:

    We know \[m=\frac{{{x}_{B}}\times 1000}{(1-{{x}_{B}}){{m}_{A}}}\] (i) \[{{x}_{B}}=\] Mole fraction of solute = 0.04 \[{{m}_{A}}=\] Molar mass of solvent = 18 Putting these values in Eqn. (i), we get \[m=\frac{0.04\times 1000}{(1-0.04)\times 18}=2.31\]  


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