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Question

For gases CH4(g) and N2(g) Both gases are in the same sealed flask with a total pressure of 750 mmHg. The partial pressure of N2(g) is 500 mmHg. Which is / are incorrect graph.


Correct Answer
A
Your Answer
B
Correct Answer
C
Correct Answer
D

Solution

The correct options are
A
C
D
Use maxwell-Boltzmann's distribution of molecular velocity curve or equation. 
The maxwell equation is:
dNN=(m2πkBT)12emv22kBTdV
By analyzing above equation we can find the correct graph.

A) CH4 has greater most probable velocity than N2 since it is lighter in mass and also number of molecules of  N2 is more than that of CH4 since it has more partial pressure.

B) Heavier molecules have small distribution since they move slowly and lighter molecules have broad distribution. Also number of molecules of  N2 is more than that of CH4 since it has more partial pressure.

C) CH4 has greater most probable velocity than N2 since it is lighter in mass.

D) Partial pressure of N2 gas is more than CH4. Hence the graph D is wrong.

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