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6.8 General or Ideal Gas Equation

The General or Ideal Gas Equation is obtained by combining relations such as Boyle’s Law, Charles’ Law and Avogadro’s Law.

PV = nRT where

P- Pressure

V - Volume

R - Constant

T - Temperature

This relation is referred to as ’Ideal gas Equation’ as it holds good only when the gases are behaving as 'ideal' or perfect gases.

R can be calculated as follows :

We know that 1 mole of an ideal gas occupies 22.4 liter at S.T.P. (Standard Temperature & Pressure, i.e 1 atm. pressure and 273 K )


Units of Gas constant R

1) R = 0.082 liter atm deg-1 mol-1

2) R = 8.31 ´ 107 ergs deg-1 mol-1

3) R = 8.31 J deg-1 mol-1

4) R = 2 cal K-1 mol-1

 Finally at Glance

No.

Gas Law

Mathematical expression

At constant

1.

Boyle’s

P1V1 = P2V2

Temperature

2.

Charles

V1/ V2 = T1/T2

Pressure

3.

Pressure-Temperature

P1/T1 = P2/T2

Volume

4.

Graham’s

Temperature

Pressure

5.

Gas equation

PV = nRT

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[next chapter]

Index

6.1 The Gaseous States Properties
6.2 Boyle's Law
6.3 Charle's Law
6.4 Pressure - Temperature Law
6.5 Gay Lussac's Law
6.6 Avogadro's Law
6.7 Graham's Law of Diffusion
6.8 General Gas Equation

Chapter 7





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