Question

The pressure of moist gas at a given temperature is 10 mm $Hg$ at vol. $V$. Extension at this temperature is 3 mm $Hg$. The final pressure of gas at the same temperature if the volume is reduced to 1/3 original volume is:

• A. 30mm $Hg$
• B. 27mm $Hg$
• C. 24mm $Hg$
• D. 21mm $Hg$

Answer 1

Answer: (A)

30mm $Hg$

As temperature is constant

$P_1{V}_1=P_2{V}_2$

$\Rightarrow 10\times V=P_2\times \frac{V}{3}$

$\Rightarrow P_2=30mm$ of $Hg$

Option A is correct.