Waec Model Questions Vol1 2020 Physics Question 7

Practice essay / theory question 7 from the 2020 Waec Model Questions Vol1 Physics examination. This question covers Pressure .

Waec Model Questions Vol1 2020 Physics Essay / Theory

Topic: Pressure

Question 7 WAEC_MODEL_QUESTIONS_VOL1 • 2020 • PHYSICS • essay

A rigid, sealed container of internal volume 2.0 L initially contains a mixture of nitrogen and oxygen gases at 27°C and a total pressure of 1.0 atm. The mole fraction of nitrogen in the mixture is 0.70. The container is then heated to 127°C, causing the pressure to increase. To bring the pressure back to 1.0 atm at the new temperature, a valve is opened and some gas is allowed to escape until the pressure stabilises at 1.0 atm while the temperature is maintained at 127°C.

Question Parts

( a )

Calculate the initial total number of moles of gas in the container.

( b )

Determine the total number of moles of gas remaining in the container after the valve is closed.

( c )

Find the mass of nitrogen that has escaped from the container (give your answer to two significant figures).

( d )

Explain why no work is done on or by the gas during the heating and venting processes.

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About This Question

This is Waec Model Questions Vol1 2020 Physics Question 7. It is one of the essay questions from the 2020 Waec Model Questions Vol1 Physics examination.

The question covers Pressure .

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