Neco 2023 Chemistry Question 6

Practice essay / theory question 6 from the 2023 Neco Chemistry examination. This question covers States of Matter .

Neco 2023 Chemistry Essay / Theory

Topic: States of Matter

Question 6 NECO • 2023 • CHEMISTRY • essay

A 2.00 L sealed container is initially at 25 °C and contains only water vapour at a pressure equal to the saturated vapour pressure of water at that temperature (23.8 mmHg). The container is then heated to 75 °C and the total pressure inside rises to 150 mmHg. Assume that no water condenses during heating and that water vapour behaves as an ideal gas.

( a )

Write the expression that relates the amount of water vapour (in moles) to the pressure, volume and temperature of the gas.

( b )

Calculate the number of moles of water vapour present in the container at 25 °C.

( c )

Determine the number of moles of water vapour present after the container has been heated to 75 °C.

( d )

Calculate the mass of water that has evaporated during the heating process.

( e )

Briefly explain why the ideal‑gas assumption is reasonable for water vapour in this experiment.

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This is Neco 2023 Chemistry Question 6. It is one of the essay questions from the 2023 Neco Chemistry examination.

The question covers States of Matter .

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