A gas at 27 degrees C is heated at constant pressure until its volume doubles. Its final temperature is
Correct answer: C. 327 degrees C
- A. 54 degrees C
- B. 300 degrees C
- C. 327 degrees C
- D. 600 degrees C
Explanation
Charles's law must be applied in kelvin, so the initial temperature is 27 plus 273, which is 300 K. Doubling the volume doubles the absolute temperature to 600 K, and converting back gives 600 minus 273, which is 327 degrees Celsius. Doubling 27 to get 54 is the standard mistake and comes from using Celsius directly.
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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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