Entropy of Vaporisation (AQA A-Level Chemistry): Quizzes

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Entropy of Vaporisation
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What is the value of ΔG∘\Delta G^\circ at the boiling point of water?

Zero

Which formula relates entropy change to enthalpy change at the boiling point?

ΔS∘=ΔH∘T\Delta S^\circ = \frac{\Delta H^\circ}{T}

What is the approximate power rating of the electric kettle used in this experiment?

3 kW

What is the accuracy of the top-pan balance used in this experiment?

±0.1 g

What volume of water is added to the kettle in the procedure?

1 dm³

For how long is the water boiled in this experiment?

100 seconds

What is the total energy supplied if a 3 kW kettle runs for 100 seconds?

300 kJ

What is the molar mass of water used in the calculations?

18 g mol⁻¹

What temperature in Kelvin is used to calculate ΔS∘\Delta S^\circ for water vaporisation?

373 K

What is the calculated entropy change for the vaporisation of water?

111.4 J mol⁻¹ K⁻¹

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