If 0.5 moles of NaCl is dissolved in 1 liter of water, what is the molality of t

₹0.0

Question: If 0.5 moles of NaCl is dissolved in 1 liter of water, what is the molality of the solution? (2022)

Options:

Correct Answer: 0.5 m

Exam Year: 2022

Solution:

Molality (m) = moles of solute / kg of solvent. Assuming 1 L of water = 1 kg, molality = 0.5 moles / 1 kg = 0.5 m.

If 0.5 moles of NaCl is dissolved in 1 liter of water, what is the molality of the solution? (2022)

If 0.5 moles of NaCl is dissolved in 1 liter of water, what is the molality of the solution? (2022)

Step 1: Identify the amount of solute (NaCl) in moles. In this case, it is 0.5 moles.
Step 2: Identify the amount of solvent (water) in liters. Here, it is 1 liter.
Step 3: Convert the volume of water from liters to kilograms. Since 1 liter of water is approximately equal to 1 kilogram, we have 1 kg of water.
Step 4: Use the formula for molality, which is molality (m) = moles of solute / kg of solvent.
Step 5: Substitute the values into the formula: molality = 0.5 moles / 1 kg.
Step 6: Calculate the molality: 0.5 moles / 1 kg = 0.5 m.

Molality – Molality is a measure of the concentration of a solute in a solution, defined as the number of moles of solute per kilogram of solvent.
Moles and Mass Relationship – Understanding the relationship between moles of solute and the mass of solvent is crucial for calculating molality.