Chemistry Class 11 NCERT Solutions: Chapter 5 States of Matter Part 3

Q: 7. What will be the pressure exerted by mixture of 3.2 g of methane and 4.4 g of carbon dioxide contained in a 9 Equation flask at Equation ?

Answer:

It is known that,

Equation

For methane Equation

Equation

Equation

For carbon dioxide ( Equation ),

Equation

Equation

Total pressure exerted by the mixture can be obtained as:

Equation

Equation

Equation

Hence, the total pressure exerted by the mixture is Equation

Q: 8. What will be the pressure of the gaseous mixture when Equation at 0.8 bar and 2.0 L of Dioxygen at 0.7 bar are introduced in a 1L vessel at Equation ?

Answer:

Let the partial pressure of Equation vessel be Equation .

Now,

Equation

It is known that,

Equation

Equation

Equation

Equation

Now, let the partial pressure of Equation in the vessel be Equation

Now,

Equation

Equation

Equation

Equation

Equation

Total pressure of the gas mixture in the vessel can be obtained as:

Equation

Equation

Equation

Hence, the total pressure of the gaseous mixture in the vessel is 1.8 bar

Q: 9. Density of a gas is found to be Equation bar pressure. What will be its density at STP?

Answer:

Given,

Equation

Equation

Equation

Equation

Equation

Equation

The density ( Equation ) of the gas at STP can be calculated using the equation,

Equation

Equation

Equation

Equation

Equation

Equation

Hence, the density of the gas at STP will be Equation .

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