A gas occupies 500 cm3 at 2 atm. At constant temperature, what volume will it occupy at 1 atm?
Correct answer: C. 1000 cm3
- A. 250 cm3
- B. 500 cm3
- C. 1000 cm3
- D. 1500 cm3
Explanation
Using P1V1 equals P2V2, the new volume is 2 multiplied by 500 divided by 1, which is 1000 cm3. Halving the pressure doubles the volume, so an answer smaller than the original must be wrong at a glance. Checking the direction of the change before calculating catches most errors.
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About Boyle's Law
Boyle's law states that the pressure of a fixed mass of gas varies inversely with its volume when temperature remains constant. Problems use the relationship P₁V₁ = P₂V₂, pressure-volume graphs and volume changes, with constant temperature distinguishing it from Charles's law.
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