Gases

Question 8.

What is the difference an ideal gas and a real gas?

Answer.

Ideal gas:

1. It obeys all gas laws under all conditions of temperature and pressure.

2. Volume occupied by its molecules is negligible as compared to total volume occupied by the gas.

3. Forces of attractions or repulsion among gas molecules are negligible.

4. It obeys general gas equation i. e.

PV =nRT

5. Its compressibility factor PV/RT is constat at all temperatures and pressures.

Non-Ideal gas:

1. It does not obey all gas laws under all conditions of temperature and pressure.

2. Volume occupied by its molecules is not negligible as compared to total volume occupied by the gas.

3. Forces of attractions or repulsion among gas molecules are not negligible.

4. It does not obeys general gas equation. It obeys vander Wall equation i. e.

(P +an2/V2)(V-nb) =nRT

5. Its compressibility factor PV/RT is constat at all temperatures and pressures.

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