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A fixed sample of xenon occupies 3 L at 320 kPa. What is its volume at 640 kPa if temperature is constant? Assume ideal-gas behavior.

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A) 0.75 L

B) 3 L

C) 1.5 L

D) 6 L

Answer: C

Explanation: Boyle’s law keeps pressure times volume constant for fixed gas amount and temperature. The pressure doubles from 320 to 640 kPa, so 3 L becomes 1.5 L.

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