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

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Q. The species which by definition has zero standard molar enthalpy of formation at $298 \,K$ is

IIT JEEIIT JEE 2010Thermodynamics

Solution:

Elements in its standard state have zero enthalpy of formation. $Cl_2$ is gas at room temperature, therefore $\Delta H^\circ_f$ of $Cl_2(g)$ is zero