The species which by definition has ZERO stan | vedclass

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Question

(B) By definition,the standard molar enthalpy of formation $(\Delta_fH^circ)$ of an element in its most stable state at $298 \ K$ and $1 \ 	ext{bar}$

Vedclass · Accepted Answer

$Cl_{2(g)}$

Vedclass · Answer

(B) By definition,the standard molar enthalpy of formation $(\Delta_fH^circ)$ of an element in its most stable state at $298 \ K$ and $1 \ 	ext{bar}$ pressure is $ZERO$. $Cl_{2(g)}$ is the most stable form of chlorine at $298 \ K$. $Br_{2(l)}$ is the most stable form of bromine at $298 \ K$,so $Br_{2(g)}$ does not have a zero enthalpy of formation. $H_2O_{(g)}$ and $CH_{4(g)}$ are compounds,not elements,so their standard enthalpy of formation is not zero.

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

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