1.If we have 10 molal urea solution, calculate the mole fraction of urea and also calculate the w/w % of urea?

Mole fraction is a ratio of the moles of one substance to the total moles in the mixture. Molality is the ratio of the moles of the solute to 1 kilogram of the solvent. You can compute the moles of solvent.

 

In a 10 molal solution of urea we have 10 moles of urea, and ...

1000 grams H2O x 1 mol H2O / 18 g H2O = 55.6 mol water.

 

So the mole fraction of urea is ...

10 / (10 + 55.6) = 0.1524

 

%(w/w) for the urea solution

mass of solute (urea) =60 g

mass of solution = 1L= 1000g +60 g = 1060 g

wt. % (w/w) = (mass solute) ÷ (mass solution) × 100%

   = (60/1060)x100%

  = 5.66%

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hello sachin , is there any MA given in the que. or even what is solvent 

ans => XB =1/(MA + 100)

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No it is not given...

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