Question

The species which by definition has ZERO standard molar enthalpy of formation at 298 K is (a) Br₂ (g) (b) Cl₂ (g)(c) H₂O (g) (d) CH₄ (g)

Answer 1

c) option is your correct answer l think so

Answer 2

c) H₂O has ZERO standard molar enthalpy of formation at 298 K