Which of the following compounds has a standa | vedclass

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(B) The standard molar enthalpy of formation $(\Delta_f H^\circ)$ of an element in its most stable state at $298 \ K$ and $1 \ bar$ pressure is define

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$Cl_{2(g)}$

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(B) The standard molar enthalpy of formation $(\Delta_f H^\circ)$ of an element in its most stable state at $298 \ K$ and $1 \ bar$ pressure is defined as zero.Among the given options,$Cl_{2(g)}$ is the most stable form of chlorine at $298 \ K$,so its enthalpy of formation is zero.$Br_{2(l)}$ is the most stable form of bromine at $298 \ K$,but the option provided was $Br_{2(l)}$ (liquid),which is correct; however,$Cl_{2(g)}$ is also a standard element in its stable state.$H_2O_{(g)}$ and $CH_{4(g)}$ are compounds,so their enthalpy of formation is not zero.

Which of the following compounds has a standard molar enthalpy of formation equal to zero at $298 \ K$?

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