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Difference between Molarity and Molality Video Lecture | Chemistry Class 11 - NEET
FAQs on Difference between Molarity and Molality Video Lecture - Chemistry Class 11 - NEET
| 1. What is the definition of molarity? |  |
Ans.Molarity is a measure of the concentration of a solute in a solution. It is defined as the number of moles of solute per liter of solution, expressed in moles per liter (mol/L or M).
| 2. How is molality defined and calculated? | |
Ans.Molality is a measure of the concentration of a solute in a solvent. It is defined as the number of moles of solute per kilogram of solvent, expressed in moles per kilogram (mol/kg). To calculate it, divide the number of moles of solute by the mass of the solvent in kilograms.
| 3. What is the main difference between molarity and molality? | |
Ans.The main difference between molarity and molality is that molarity is based on the volume of the solution, while molality is based on the mass of the solvent. Molarity varies with temperature due to changes in volume, whereas molality remains constant as it depends only on mass.
| 4. In what scenarios is it more appropriate to use molality instead of molarity? | |
Ans.Molality is more appropriate to use in scenarios involving temperature changes, such as in boiling point elevation or freezing point depression, because it is not affected by volume changes, unlike molarity which can change with temperature.
| 5. How do you convert between molarity and molality? | |
Ans.To convert between molarity and molality, you need the density of the solution. You can use the formula: molarity (M) = molality (m) × (density of the solution in kg/L) / (1 + (m × molar mass of solute / density of solution)). This allows you to relate the two based on the specific solution's properties.
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