First slide

Gaseous state

Question

A quantity of gas is confined in a chamber of constant volume. When the chamber is immersed in a bath of melting ice, the pressure of the gas is 1000 torr. Final temperature when the pressure manometer indicates an absolute pressure of 400 torr, is

Easy

A

109 K
B

273 K
C

373 K
D

0 K

Solution

Initial temperature (of melting ice) = 0^oC = 273 K
At constant volume p $\propto$ T
$∴ T_{2} = \frac{p_{2} T_{1}}{p_{1}} = \frac{400 \times 273}{1000} = 109 .2 K$

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