Question

A vessel contains equal number of molecules of hydrogen and helium
under a pressure of 800 mm at 0°C. If all the helium molecules are
removed from the vessel, the pressure in the vessel becomes
(A) 600 mm
(B) 200 mm
(C) 400 m.m
(D) 500 mm​

Answer 1

Answer:

400 mm

Since pressure at constant temperature and volume is directly proportional to the no. of gas molecules,

The pressure becomes exactly half of the initial pressure as the no. of molecules are halved.

Apply Avagadro's law.

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Explanation:

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Answer 2

Answer:

C) 400 mm✔️

Explanation:

Answer by @Missmiracle12 ❤️