the concentration of urea (MW=60.0g/mol) in a solution prepared by dissolving 23g of urea in 64g of H2O is ____ molal

Answer 1

molal means moles of solute per kg of solvent

moles of urea ... (mass of urea) / (molar mass of urea)

kg of H2O ... (mass of H2O) / (1000 g / kg)