The work done by an ideal gas expanding at constant pressure is given by:

A w = -PΔV

B w = nRT

C w = ΔU

D w = qv

✓ Correct Answer: Option A

At constant pressure, work done by the gas on surroundings: w = −PΔV (negative sign by convention when gas expands, system does work).

💡 Why is A) the correct answer?

The correct answer to the question "The work done by an ideal gas expanding at constant pressure is given by:" is Option A: w = -PΔV.

The other options — B) w = nRT, C) w = ΔU, D) w = qv — are incorrect for this Everyday Science question. As explained above: At constant pressure, work done by the gas on surroundings: w = −PΔV (negative sign by convention when gas expands, system does work).

📚 About This Everyday Science Practice Question

This 2-level Everyday Science question from the Chemistry - Elements & Compounds topic is part of One Paper Preparation's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free Everyday Science practice test or use flashcards for spaced repetition review.

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The work done by an ideal gas expanding at constant pressure is given by:

✓ Correct Answer: Option A

📚 About This Everyday Science Practice Question

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