Question

Molality of 40% urea solution is

Answer 1

Answer:

Since % by mass is given which say's that 40g of urea(solute) is present in 100g of solution (not solvent) hence 60g of solute contains 40g of solvent hence 1000g will contain 40*1000/60 g. Hence moles present in solution will be 40*1000/60*60. This value of moles is equal to molality of solution.

Answer 2

Explanation:

Answer: Since % by mass is given which say's that 40g of urea(solute) is present in 100g of solution (not solvent) hence 60g of solute contains 40g of solvent hence 1000g will contain 40*1000/60 g. Hence moles present in solution will be 40*1000/60*60. This value of moles is equal to molality of solution