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(D) The standard enthalpy of formation,$\Delta_{f}H^{\circ}$,is defined as $0$ for an element in its most stable physical state at $25\,^{\circ}C$ $(2

Vedclass · Accepted Answer

$C(	ext{graphite}), Br_{2(l)}, I_{2(s)}$

Vedclass · Answer

(D) The standard enthalpy of formation,$\Delta_{f}H^{\circ}$,is defined as $0$ for an element in its most stable physical state at $25\,^{\circ}C$ $(298 \ K)$ and $1 \ bar$ pressure.$1$. Carbon is most stable as $C(	ext{graphite})$,not diamond.$2$. Bromine exists as a liquid,$Br_{2(l)}$,at standard conditions.$3$. Iodine exists as a solid,$I_{2(s)}$,at standard conditions.Therefore,the set $C(	ext{graphite}), Br_{2(l)}, I_{2(s)}$ represents elements in their standard states where $\Delta_{f}H^{\circ} = 0$.

Which of the following sets represents the normal physical states of the elements concerned at $25\,^{\circ}C$ and $1 \ bar$ pressure,for which $\Delta H^{\circ}_{f} = 0$?

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