Question

Dissolving 120 g of urea (mol. Wtwt. 60) in 1000 g of water gave a solution of density 1.15 g/ml. The molarity of the solution is

Answer 1

answer is molarity equals to 2explanation equals to molarity =number of moles of solute/volume of solution in litre therefore first we have to find volume of solution=mass upon density of solution therefore mass of solution equals to 1120 divided by 1. 15 into to 10 raise to 3 because density is given 1.15 gram per ml therefore volume of solution equals to 0. 974and we have to find number of moles of solute equals to mass upon molar mass equals to 120 / 60 equals to 2 therefore molality e equals to 2/0.974=almost equals to 2.1