Kinetic Theory - Result Question 19

19. Three containers of the same volume contain three different gases. The masses of the molecules are m1,m2 and m3 and the number of molecules in their respective containers are N1, N2 and N3. The gas pressure in the containers are P1,P2 and P3 respectively. All the gases are now mixed and put in one of these containers. The pressure P of the mixture will be

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(a) P<(P1+P2+P3)

(b) P=P1+P2+P33

(c) P=P1+P2+P3

(d) P>(P1+P2+P3)

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Answer:

Correct Answer: 19. (c)

Solution:

  1. (c) According to Dalton’s law of partial pressures, we have P=P1+P2+P3

Dalton’s law will be valid only if the gases contained are non reacting.

For n non-reacting gases, P=P1+P2+P3+Pn Here P= Pressure exerted by mixture P1,P2,P3..Pn= Partial pressure of component gas.



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