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 =Mass of moles of ureaMass of solventin ml×1000Moles of urea =0.601060molWater at STP (d=1g/cm3=1kg/dm3)=0.3dm3=0.3kg∴ Molality =0.01060×0.3=5.55×10-4m