A sealed gas syringe contains air at a pressure of 100 kPa and volume of 60 cm³. The plunger is pushed in until the volume is 20 cm³. The temperature remains constant. What is the new pressure of the gas?

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Question

A sealed gas syringe contains air at a pressure of 100 kPa and volume of 60 cm³. The plunger is pushed in until the volume is 20 cm³. The temperature remains constant. What is the new pressure of the gas?

Accepted Answer

300 kPa — Award 1 mark for correct application of Boyle's law. p₁V₁ = p₂V₂, so 100 × 60 = p₂ × 20, giving p₂ = 6000/20 = 300 kPa. A is incorrect — this incorrectly divides pressure by 3. B is incorrect — pressure changes when volume changes at constant temperature. C is incorrect — this adds volumes rather than using the inverse relationship.

Answer

180 kPa

Answer

100 kPa

Answer

300 kPa

Answer

33 kPa

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