molality = moles of solute / kg of solvent In this equation, H2SO4 is the solute and water is the solvent 0.91 mol / 0.011 kg = 83 mol/kg Solution molality = moles of solute / kg of solvent In this equation, H2SO4 is the solute and water is the solvent 0.91 mol / 0.011 kg = 83 mol/kg.