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Which gas closely approaches ideal behaviour at room temperature and pressure? A - CIE - A-Level Chemistry - Question 1 - 2010 - Paper 1
Question 1
Which gas closely approaches ideal behaviour at room temperature and pressure? A. ammonia B. carbon dioxide C. helium D. oxygen
Worked Solution & Example Answer:Which gas closely approaches ideal behaviour at room temperature and pressure? A - CIE - A-Level Chemistry - Question 1 - 2010 - Paper 1
Step 1
Identify the gas that approaches ideal behavior
Answer
At room temperature and pressure, certain gases exhibit behavior closer to the ideal gas law, which assumes no intermolecular forces and that the particles occupy no volume. Among the options provided:
- Ammonia (NH₃): A polar molecule with significant intermolecular forces (hydrogen bonding), hence it doesn't behave ideally.
- Carbon dioxide (CO₂): A linear molecule with some intermolecular forces, but still less ideal than inert gases.
- Helium (He): A noble gas with negligible intermolecular forces and very low polarizability, making it behave closely to an ideal gas.
- Oxygen (O₂): A diatomic, non-polar gas but exhibits some deviation due to molecular size and interactions.
Therefore, the gas that closely approaches ideal behavior at room temperature and pressure is C. helium.