Molarity ↔ molality

Relate M and m using solution density (kg/L) and solute molar mass.

Calculator

Model / formula

Uses solution density ρ (g/mL) and solute molar mass — idealized

Direction

Solution density ρ (g/mL)

Solute molar mass (g/mol)

Molarity M (mol/L)

Result

molality m = 0.5047 mol/kg

Uses ρ and M_solute — check units.

Educational use only. Double-check values for labs, homework, and exams.