Partial Pressure, Ideal Gases and Partial Pressure, Dalton՚s Law, Questions (For CBSE, ICSE, IAS, NET, NRA 2022)

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To a Tank Containing at and at , We Add an Anonymous Quantity of up Until the Total Pressure Inside the Tank is . What is S Partial Pressure?


Dalton՚s law states that the addition of does not upset the partial pressures of the and already existing in the tank. The partial pressure of and remain at , respectively, and their total is 3.0 atm. The partial pressure of the added must be if the new pressure is , Therefore, when the final pressure is , the partial pressures are

A Mixture of Hydrogen Gas and Oxygen Gas Exerts a Total Pressure of on the Walls of Its Container. If the Partial Pressure of Hydrogen is , Find the Mole Fraction of Oxygen in the Mixture


  • Given,
  • Applying Dalton՚s law formula,

  • Therefore,
  • Now, the mole fraction of oxygen,

Therefore, the mole fraction of oxygen in the mixture is

At a Temperature of , of Gas a Kept under Pressure of and of Gas B Kept under Pressure of is Transferred into an Empty Container. Calculate the Total Pressure Inside the Container and the Partial Pressures of Gas a and Gas B (Assume That a and B Are Ideal Gases)


  • From the ideal gas equation,
  • Number of moles of gas A

Number of moles of gas B

  • Total number of moles in the gaseous mixture
  • Total pressure inside the 10 L container

  • Therefore, the total pressure inside the 10-litre container is .
  • Mole fraction of gas A Mole fraction of gas B
  • Therefore, partial pressure of gas A Therefore, partial pressure of gas B
  • Thus, the partial pressures of gases A and B in the container are both equal to .

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