For water at 0 °C, ΔH_fus = 6.01 kJ mol⁻¹ and ΔH_sub = 46.7 kJ mol⁻¹
CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics
Problem
For water at 0 °C, ΔH_fus = 6.01 kJ mol⁻¹ and ΔH_sub = 46.7 kJ mol⁻¹. At 100 °C, ΔH_vap = 40.7 kJ mol⁻¹. Consider the following equal-mass (18 g) processes:
I. Melting ice at 0 °C
II. Vaporizing liquid water at 100 °C
III. Subliming ice at 0 °C
Which ordering ranks the processes by energy absorbed (kJ), from greatest to least?
(a) II > III > I
(b) I > II > III
(c) III > II > I
(d) II > I > III