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

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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 flask at ?

Answer:

It is known that,

For methane

For carbon dioxide (),

Total pressure exerted by the mixture can be obtained as:

Hence, the total pressure exerted by the mixture is

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

Answer:

Let the partial pressure of vessel be.

Now,

It is known that,

Now, let the partial pressure of in the vessel be

Now,

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

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 bar pressure. What will be its density at STP?

Answer:

Given,

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

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