To find the molality of an aqueous solution containing 1g/L of a protein with a molar mass of 9.0 x 10^4 g/mol, first recognize that molality is defined as moles of solute per kilogram of solvent. Given the density of the solution is 1 g/cm³, 1 liter of solution weighs 1 kg. Since the solution contains 1 g of protein, the mass of the solvent is approximately 1 kg, assuming the volume change is negligible. Therefore, the molality can be calculated using the moles of protein derived from its mass and the mass of the solvent. This approach allows for the determination of molality without needing to calculate the kilograms of solvent directly.
