What is the molality of a solution prepared by dissolving 5 moles of NaCl in 2 kg of water?
Correct Answer: 2.5 mol/kg
- Step 1: Identify the number of moles of the solute (NaCl). In this case, it is 5 moles.
- Step 2: Identify the mass of the solvent (water) in kilograms. Here, it is 2 kg.
- Step 3: Use the formula for molality, which is molality (m) = moles of solute / mass of solvent (kg).
- Step 4: Plug in the values into the formula: m = 5 moles / 2 kg.
- Step 5: Calculate the result: 5 divided by 2 equals 2.5.
- Step 6: State the final answer: The molality of the solution is 2.5 mol/kg.
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