A gas occupies 500 cm3 at 2 atm. At constant temperature, what volume will it occupy at 5 atm?
Correct answer: A. 200 cm3
- A. 200 cm3
- B. 250 cm3
- C. 1250 cm3
- D. 100 cm3
Explanation
Applying P1V1 equal to P2V2 gives V2 equal to 2 times 500 divided by 5, which is 200 cm3. The pressure rose by a factor of 2.5, so the volume must fall by the same factor, and 500 divided by 2.5 is 200. Getting 1250 means the ratio was applied the wrong way round.
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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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