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

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Entropy of Vaporisation
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ΔG°\Delta G° at boiling point

Zero (equilibrium)

Formula: ΔS°\Delta S° in terms of ΔH°\Delta H° and TT

ΔS°=ΔH°T\Delta S° = \frac{\Delta H°}{T}

Power rating of kettle used

3 kW

Boiling time in experiment

100 seconds

Volume of water used

1 dm31 \, \text{dm}^3 (1000 cm³)

Energy supplied formula

Power × Time

Molar mass of water

18 g mol−118 \, \text{g mol}^{-1}

Boiling point of water (in K)

373 K

Balance accuracy

±0.1 g

Calculated ΔS°\Delta S° for water vaporisation

Approx. 111.4 J mol−1 K−1111.4 \, \text{J mol}^{-1} \, \text{K}^{-1}

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