The species which by definition has ZERO standard molar enthalpy of formation at 298 K is

Br₂(g)

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Cl₂(g)

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H₂O(g)

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CH₄(g)

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Solution

The correct option is B
Cl₂(g)

The species in its elemental form has zero standard molar enthalpy of formation at 298 K. At 298 K, $C l_{2}$ is gas while $B r_{2}$ is liquid

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The species which by definition has ZERO standard Molar enthalpy of formation at 298 k is

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The standard enthalpy of formation $(Δ_{f} H^{0})$ at 298K for methane, $C H_{4} (G)$ is 74.8kJmol $^{- 1}$ . The additional information required to determine the average energy for C-H bond formation would be

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The species which by definition has ZERO standard molar enthalpy of formation at 298 K is

The correct option is B Cl2(g) The species in its elemental form has zero standard molar enthalpy of formation at 298 K. At 298 K, Cl2 is gas while Br2 is liquid

The correct option is B
Cl₂(g)

The species in its elemental form has zero standard molar enthalpy of formation at 298 K. At 298 K, $C l_{2}$ is gas while $B r_{2}$ is liquid