Calculadora de Molalidade

The molality calculator determines the concentration of a solution expressed in moles of solute per kilogram of solvent. Unlike molarity, molality does not vary with temperature because it depends on the mass of the solvent, not the volume. It is widely used for colligative properties, such as boiling point elevation and freezing point depression.

To calculate molality, enter the amount of solute in moles and the mass of the solvent in kilograms. The formula is m = n_solute / kg_solvent. If you have the mass of the solute and its molar mass, you can calculate moles first. For example, 0.5 mol of NaCl dissolved in 0.2 kg of water results in a molality of 2.5 mol/kg.

Use this calculator in chemistry labs, preparing solutions for experiments requiring precise temperature control, or in industries dealing with colligative properties. It is essential for cryoscopy and ebulliometry calculations, where molality is the standard unit.

Caution: do not confuse molality with molarity. Molality uses solvent mass (kg), while molarity uses solution volume (L). Ensure the solvent mass is in kilograms and the solute is in moles. If the solute is a solid, calculate moles by dividing the mass by the molar mass.