Question:

In water saturated air, the mole fraction of water vapour is $0.02$. If the total pressure of the saturated air is $1.2\, atm$, the partial pressure of dry air is :

Updated On: Dec 5, 2024
  • 1.18 atm
  • 1.76 atm
  • 1.176 atm
  • 0.98 atm
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The Correct Option is C

Solution and Explanation

$X_{H_2O} = 0.02$
$\therefore X_{gas} = 0.98$
$P_{total} =1.2 \,atm$
partial pressure of dry-air $= P_T \times $ mole fraction of dry-air
Partial pressure of dry-air $= 1.2\, atm \times 0.98$
$= 1 .176 \,atm$.
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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:

  1. Unsaturated Solution- A solution in which more solute can be dissolved without raising the temperature of the solution is known as an unsaturated solution.
  2. 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.
  3. Supersaturated Solution- A solution that contains more solute than the maximum amount at a certain temperature is known as a supersaturated solution.