Question

A gas is enclosed in a vessel of volume 1000 ml at a pressure of 72.6 cm of Hg .it is
being evacuated with the help of a piston pump, which expels 10% gas in each stroke.
What will be the pressure after the second stroke?
1. 50 cm
2.56.6cm
3 .58.8 cm
4. 66

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

3

Explanation:

Since 10% of gas is expelled after each stroke,

and PV = constant (assumption for the process)

The pressure also reduces by 10%.

Initial pressure is 72.6cm of Hg.

After one stroke, 90% of 72.6cm = 65.34cm of Hg

After second stroke, 90% of 65.34cm = 58.8cm of Hg

Which is closest to 60cm of Hg.

Option A is correct.