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

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in Chemical thermodynamics by (64.8k points)

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

(A) Br2 (g) 

(B) Cl2 (g) 

(C) H2 O(g) 

(D) CH4 (g)

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1 Answer

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Best answer

Correct option (B) Cl2 (g)

Explanation:

Elements in its standard state have zero enthalpy of formation. Cl2 is gas at room-temperature, ∆ H°f of Cl2 (g) is zero.

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