The molality of a urea solution in which 0.0100 g of urea,[(NH2)2CO] is added to 0.3000 dm3 of water at STP is

Molality = Moles of solute  Mass of water (in kg)  Moles of urea =0.01060molMass of water at STPd=1g/cm3=1kg/dm3=0.3dm3=0.3kg∴  Molality =0.01060×0.3=5.55×10−4 molal