Pressure remain constant, at which temperature the volume of gas becomes twice of what it is at 0°C?
Correct answer: B. 546 K
- A. 546 °C
- B. 546 K
- C. 200°C
- D. 273 K
Explanation
At constant pressure, Charles's law states that volume is proportional to absolute temperature. The initial temperature is 0°C + 273 = 273 K, so doubling the volume requires 2 x 273 K = 546 K, equal to 273°C. Students may choose 546°C by doubling the Celsius value, but gas-law temperatures must be in kelvin.
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About Charles's Law
At constant pressure, the volume of a fixed mass of gas is directly proportional to its absolute temperature. Questions involve the Kelvin scale, the equation V₁/T₁ = V₂/T₂, volume-temperature graphs, and the need to distinguish Charles's law from Boyle's law, which relates pressure and volume.
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