First slide

Ideal Gas Postulates

Question

An ideal gas is expanded according to the T-V graph shown in figure. Then pressure of the gas

Moderate

A

increases
B

decreases
C

remains unchanged
D

first increases, ten decreases

Solution

$T = a + b v ...... (1)$
Also, $p V = n R T ........ (2)$
From 91) and (2), $p V = n R (a + b V) \Rightarrow p = n R (\frac{a}{V} + b)$
As V increases p decreases.

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