Waec Model Questions Vol1 2024 Physics Question 7

Practice essay / theory question 7 from the 2024 Waec Model Questions Vol1 Physics examination. This question covers Pressure .

Waec Model Questions Vol1 2024 Physics Essay / Theory
Topic: Pressure
Question 7 WAEC_MODEL_QUESTIONS_VOL1 • 2024 • PHYSICS • essay

A sealed rigid container of volume 2.0 × 10⁻³ m³ contains dry air at 300 K and a pressure of 1.00 × 10⁵ Pa. The container is placed in a water bath whose temperature is gradually increased to 350 K. After heating, a friction‑less piston of cross‑sectional area 5.0 × 10⁻⁴ m² is fitted to the container and released so that the gas expands until its internal pressure equals the constant external atmospheric pressure of 1.01 × 10⁵ Pa. Assume air behaves as an ideal gas and that atmospheric pressure does not change during the experiment.

Question Parts

( a )
Determine the mass of air initially present in the container.
( b )
Find the final volume of the gas when the pressure has equalised with atmospheric pressure after heating to 350 K.
( c )
During the expansion the piston moves a distance d. Using the piston area given, calculate the work done by the gas on the piston.
( d )
Discuss qualitatively how the final state would differ if the container were not rigid but allowed the gas to expand freely while being heated to 350 K, keeping the external pressure constant at 1.01 × 10⁵ Pa.

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About This Question

This is Waec Model Questions Vol1 2024 Physics Question 7. It is one of the essay questions from the 2024 Waec Model Questions Vol1 Physics examination.

The question covers Pressure .

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