How will the conditions be changed to prevent the volume of the given gas from expanding when its mass is increased?
Correct answer: D. Temperature is lowered and pressure is increased
- A. Temperature and pressure is increased
- B. Temperature is lowered and pressure is decreased
- C. Temperature and pressure is decreased
- D. Temperature is lowered and pressure is increased
Explanation
Option A: Temperature and pressure increased is incorrect because increasing the temperature and pressure would cause the gas to expand and occupy more space.Option B: Temperature is lowered and pressure is decreased is also incorrect because decreasing the temperature alone would cause the gas to contract, but decreasing the pressure would cause it to expand, leading to an uncertain net effect on the volume.Option C: As explained above this option is incorrect. Option D: Temperature is lowered to lower the speed of the gas molecules and pressure is increased to lower the volume of the gas.
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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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