Question

calculate the mole fraction of solute in a solution obtained by dissolving 10g of urea ( mol wt 60) in 100g of water.​

Answer 1

Answer:

if there is a solution containing two different substances A and B then mole fraction of A or B =moles of A or B /moles of A+B.

we know molar mass of urea= 60g(approx)

so moles of urea =given mass /molar mass = 6/60=0.1.

also 100 ml=100g so, moles of water=100/18=5.55

thus, mole fraction of 6g urea in 100 ml water=0.1/5.55+0.1=0.1/5.65=0.0176

Answer 2

100ml of water = 0.0176

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