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