Exam-style question
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In a sealed container, a gas is compressed from 300 mL to 150 mL at constant temperature. What is the ratio of the final pressure to the initial pressure?.
- A.1:1
- B.2:1
- C.3:1
- D.4:1
Model answer
What a good answer should say
- 2:1.
Explanation
Why this works
Formula/rule: P1V1 = P2V2. Substitution: V1 = 300 mL, V2 = 150 mL.
Working: P2 = P1 * 300/150 = 2P1, so P2/P1 = 2. Answer: 2:1.
Units/Conclusion: The pressure doubles when the volume is halved.
Common mistake
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