A gas occupies 300 cm3 at 27 degrees Celsius. At constant pressure, what volume will it occupy at 127 degrees Celsius?
Correct answer: A. 400 cm3
- A. 400 cm3
- B. 1411 cm3
- C. 200 cm3
- D. 600 cm3
Explanation
Converting to kelvin gives 300 K and 400 K, and the volume scales in the same ratio, so 300 multiplied by 400 divided by 300 gives 400 cm3. Using Celsius directly would give the wrong ratio of 127 over 27 and the absurd second option. Absolute temperature is non negotiable in every gas law calculation.
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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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