find the molality of a salt-water solution containing 0.27 mol NaCl in 150 g water.
To find the molality of a solution, you need to know the amount of solute (in moles) and the mass of the solvent (in kilograms).
Given:
- Moles of NaCl = 0.27 mol
- Mass of water = 150 g
Step 1: Convert the mass of water to kilograms:
Mass of water = 150 g = 150/1000 = 0.15 kg
Step 2: Calculate the molality (m) using the formula:
Molality (m) = Moles of solute / Mass of solvent (in kg)
Molality (m) = 0.27 mol / 0.15 kg
Step 3: Calculate the molality:
Molality (m) = 1.8 mol/kg
Therefore, the molality of the salt-water solution containing 0.27 mol of NaCl in 150 g of water is 1.8 mol/kg.