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
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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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