Neco 2025 Chemistry Question 6

Practice essay / theory question 6 from the 2025 Neco Chemistry examination. This question covers States of Matter .

Neco 2025 Chemistry Essay / Theory

Topic: States of Matter

Question 6 NECO • 2025 • CHEMISTRY • essay

A rigid sealed container of volume 2.00 L contains a mixture of nitrogen gas (N2) and oxygen gas (O2) at 298 K. The total pressure of the mixture is 1.20 atm and the partial pressure of O2 is 0.45 atm. Answer the following questions:

Question Parts

( a )

Calculate the number of moles of N2 and O2 present in the container.

( b )

The container is heated to 350 K while remaining sealed. Assuming ideal behaviour, calculate the new total pressure of the gas mixture.

( c )

The mixture is now cooled until the temperature reaches the condensation point of O2 (90.2 K) at which O2 begins to liquefy while N2 remains gaseous. Determine the pressure exerted by the remaining N2 gas at this temperature.

( d )

Explain qualitatively how the presence of both gases affects the temperature at which condensation begins compared with a container holding pure O2, referring to Dalton’s law of partial pressures.

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About This Question

This is Neco 2025 Chemistry Question 6. It is one of the essay questions from the 2025 Neco Chemistry examination.

The question covers States of Matter .

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