CBSE Class 11-science Answered

what is a mole fraction of a solute in 22.5m aqueous solution.

Asked by singhrajyadavji | 04 Mar, 2019, 08:22: PM

Expert Answer

Question: What is a mole fraction of a solute in 2.5 m aqueous solution.

Given:

Molality of solution= 2.5 m

That is 2.5 mole of solute in 1000 kg of water.

$No. space of space moles space water space equals space fraction numerator Weight space of space straight H subscript 2 straight O over denominator Molecular space wt space of space straight H subscript 2 straight O space end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 1000 over 18 space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 55.55 space mol Mole space fraction space of space solute space equals space fraction numerator No. space of space moles space of space solute over denominator No. space of space moles space of space solute space plus space No. space of space moles space of space solvent end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space fraction numerator 2.5 over denominator 55.55 plus 2.5 end fraction space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space fraction numerator 2.5 over denominator 58.05 end fraction Mole space fraction space of space solute space equals 0.043$