Which of the Following Has A $\Delta$ H ^$\circ$ _f= 0 KJ/mol
A) CO₂(g)
B) O₃(g)
C) Cl^-(aq)
D)

Multiple Choice

Which of the following has a $\Delta$ H ^$\circ$ _f= 0 kJ/mol

A) CO₂(g)
B) O₃(g)
C) Cl^-(aq)
D) NH₃(aq)
E) I₂(s)