Engineering
Chemistry
Enthalpy of Formation Combustion and Bond
Enthalpy Calculation and Meaning
Gibbs Free Energy Calculations and Third Law
Question

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

Br2 (g)

CH4 (g)

H2O (g)

Cl2 (g)

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Solution
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Because standard state of Cl2 is gas.