Three processes and their molar enthalpy changes are shown
CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics
Problem
Three processes and their molar enthalpy changes are shown.
I. 2 H₂(g) + O₂(g) → 2 H₂O(l) ΔH = −890 kJ
II. NH₄NO₃(s) → NH₄⁺(aq) + NO₃⁻(aq) ΔH = +28 kJ
III. CH₄(g) + 2 O₂(g) → CO₂(g) + 2 H₂O(g) ΔH = −802 kJ
Which sequence ranks the processes from most exothermic to most endothermic?
(a) II>I>III
(b) III>I>II
(c) I>III>II
(d) II>III>I