1. Understand Molality
* Molality (m) is a measure of concentration that expresses the number of moles of solute per kilogram of solvent. It's different from molarity, which uses liters of solution.
2. Calculate the Moles of NaCl
* Molar mass of NaCl: 58.44 g/mol (approximately)
* Moles of NaCl: (10 g NaCl) / (58.44 g/mol) = 0.171 moles NaCl
3. Convert the Mass of Water to Kilograms
* Mass of water: 2 g
* Kilograms of water: (2 g) / (1000 g/kg) = 0.002 kg
4. Calculate the Molality
* Molality (m): (0.171 moles NaCl) / (0.002 kg water) = 85.5 mol/kg
Therefore, the molality of the 10g NaCl solution in 2g water is approximately 85.5 mol/kg.
