A fixed mass of gas at 2 atm and 300 K is heated to 600 K at constant volume. The new pressure is
Correct answer: C. 4 atm
- A. 1 atm
- B. 2 atm
- C. 4 atm
- D. 8 atm
Explanation
Pressure is proportional to absolute temperature at constant volume, so doubling the temperature in kelvin doubles the pressure to 4 atm. Both temperatures are already absolute here, which removes the usual conversion trap. This is why pressurised cylinders carry warnings about heat.
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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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