1 If we have 10 molal urea solution, calculate the mole fraction of urea and also calculate the w/w % - Chemistry - Solutions

Question

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

Priya G N · Accepted Answer

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) Ã· (mass solution)
Ã— 100%

= (60/1060)x100%

= 5 66%

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