Equal samples undergo the following changes at constant pressure: Process 1: Liquid…

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

Equal

50.0\,\text{g}

samples undergo the following changes at constant pressure: Process 1: Liquid water cools from

25\,\text{°C}

5\,\text{°C}

(

c = 4.18\,\text{J}\,\text{g}^{-1}\,\text{°C}^{-1}

). Process 2: Liquid ethanol warms from

5\,\text{°C}

25\,\text{°C}

(

c = 2.44\,\text{J}\,\text{g}^{-1}\,\text{°C}^{-1}

). Process 3: Steam at

100\,\text{°C}

condenses to liquid at

100\,\text{°C}

(

\Delta H_{vap} = 40.7\,\text{kJ}\,\text{mol}^{-1}

). Rank the three processes from greatest energy released to greatest energy absorbed.