A closed container contains an ideal gas. Which of the following changes will result in decrease in pressure?
Correct answer: C. Volume = increase, temperature = decrease
- A. Volume = decrease, temperature = decrease
- B. Volume = decrease, temperature = increase
- C. Volume = increase, temperature = decrease
- D. Volume = increase, temperature = increase
Explanation
When the volume of an ideal gas is increased while keeping it in a closed container, the pressure of the gas decreases. According to Boyle's law, for an ideal gas at constant temperature, pressure and volume are inversely proportional. When the pressure decreases, the gas particles have less forceful collisions, resulting in a decrease in temperature.
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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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