In Terms of the Enthalpy of Formation, Which of the Following

question 24

Multiple Choice

In terms of the enthalpy of formation, which of the following compounds is the most unstable compared to its elements under standard conditions?

• A) KCl(s), \(\Delta\)H \({ } _ { f } ^ { \circ } \mathrm { }\)
• = - 435.9 kJ/mol
• B) PH₃(g), \(\Delta\)H \({ } _ { f } ^ { \circ } \mathrm { }\)
• = +5.4 kJ/mol
• C) Fe₃O₄(s), \(\Delta\)H \({ } _ { f } ^ { \circ } \mathrm { }\)
• = - 1,117.1 kJ/mol
• D) NiO(s), \(\Delta\)H \({ } _ { f } ^ { \circ } \mathrm { }\)
• = - 239.7 kJ/mol
• E) ICl(g), \(\Delta\)H \({ } _ { f } ^ { \circ } \mathrm { }\)
• = + 17.8 kJ/mol