ERT 108 Physical Chemistry INTRODUCTION-Part 2. by Miss Anis Atikah binti Ahmad. Thermodynamic- Basic concepts (cont.). Equilibrium: Variable ( eg : pressure, temperature, & concentration) does not change with time Has the same value in all parts of the system and surroundings.
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Miss Anis Atikahbinti Ahmad
Wall is diathermal
Both pressures change.
Reach the same value after some time.
In thermal equilibrium (T1=T2)
Wall is adiabatic
No pressure change.
Not in thermal equilibrium
When a region of high pressure is separated from a region of low pressure by a movable wall, the wall will be pushed into one region or the other:
There will come a stage when two pressures are equal and the wall has no tendency to move.
In mechanical equilibrium (P1=P2)
P= pressure, Pa
F= Force, N
at constant mass and temperature
molecules to hit the wall more often,
thereby increasing the pressure.
is a constant
P and V are inversely proportional.
P and T are directly proportional.
at constant mass and pressure
at constant mass and volume
contain the same numbers of molecules.
at constant pressure and temperature
Boyle’s and Charle’s law are examples of a limiting law that are strictly true only in a certain limit, p0
Ideal gas law
Ideal gas mixture
any gas mixture
What is the partial pressure of each component when the total
pressure is 1.20 atm?
At very low pressures, Z ≈ 1
At high pressures, Z>1
At intermediate pressure, Z<1
Compression factor, Z