Question:
Relative lowering of vapour pressure of a dilute solution of glucose dissolved in 1 kg of water is 0.002. The molality of the solution is
Relative lowering of vapour pressure of a dilute solution of glucose dissolved in 1 kg of water is 0.002. The molality of the solution is
Updated On: Apr 13, 2024
- 0.11
- 0.021
- 0.004
- 0.222
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The Correct Option is A
Solution and Explanation
$\frac{P_{0}-P}{P_{0}}=\frac{W_{2}}{M_{2}}\times\frac{M_{1}}{W_{1}}$
$0.002=\frac{W_{2}}{M_{2}}\times\frac{18}{1000}$
$\frac{w_{2}}{M_{2}}=0.11\, mole$
$Molality=\frac{w_{2}}{M_{2}}\times\frac{1000}{W_{1}}=0.11\times\frac{1000}{1000}=0.11 m$
$0.002=\frac{W_{2}}{M_{2}}\times\frac{18}{1000}$
$\frac{w_{2}}{M_{2}}=0.11\, mole$
$Molality=\frac{w_{2}}{M_{2}}\times\frac{1000}{W_{1}}=0.11\times\frac{1000}{1000}=0.11 m$
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Concepts Used:
Solutions
A solution is a homogeneous mixture of two or more components in which the particle size is smaller than 1 nm.
For example, salt and sugar is a good illustration of a solution. A solution can be categorized into several components.
Types of Solutions:
The solutions can be classified into three types:
- Solid Solutions - In these solutions, the solvent is in a Solid-state.
- Liquid Solutions- In these solutions, the solvent is in a Liquid state.
- Gaseous Solutions - In these solutions, the solvent is in a Gaseous state.
On the basis of the amount of solute dissolved in a solvent, solutions are divided into the following types:
- Unsaturated Solution- A solution in which more solute can be dissolved without raising the temperature of the solution is known as an unsaturated solution.
- Saturated Solution- A solution in which no solute can be dissolved after reaching a certain amount of temperature is known as an unsaturated saturated solution.
- Supersaturated Solution- A solution that contains more solute than the maximum amount at a certain temperature is known as a supersaturated solution.