What volume is occupied by 0.5 mole of an ideal gas at STP?
Correct answer: B. 11.2 dm3
- A. 5.6 dm3
- B. 11.2 dm3
- C. 22.4 dm3
- D. 44.8 dm3
Explanation
One mole of any ideal gas occupies 22.4 dm3 at STP, so half a mole occupies 11.2 dm3. The identity of the gas is irrelevant, which is the point of Avogadro's law. The value 5.6 dm3 would correspond to a quarter of a mole.
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About Ideal Gas Equation
The ideal gas equation, PV = nRT, relates pressure, volume, amount and absolute temperature when gas particles are assumed to have negligible volume and no intermolecular forces. Applications include finding molar mass, density or an unknown gas variable, with careful use of Kelvin temperature and consistent units, and comparison with real-gas behaviour.
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