Which of the following reactions defines Delt | vedclass

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(A) The standard enthalpy of formation,denoted as $\Delta H_f^o$,is defined as the enthalpy change that occurs when $1 \ mole$ of a substance is forme

Vedclass · Accepted Answer

$\frac{1}{2} H_{2(g)} + \frac{1}{2} F_{2(g)} 	o HF_{(g)}$

Vedclass · Answer

(A) The standard enthalpy of formation,denoted as $\Delta H_f^o$,is defined as the enthalpy change that occurs when $1 \ mole$ of a substance is formed from its constituent elements in their most stable standard states.In option $(A)$,$1 \ mole$ of $HF_{(g)}$ is formed from its elements $H_{2(g)}$ and $F_{2(g)}$ in their standard states,which fits the definition.In option $(B)$,$CO$ is a compound,not an element.In option $(C)$,carbon is in the diamond state,which is not the standard state (graphite is).In option $(D)$,$2 \ moles$ of $NH_3$ are formed,not $1 \ mole$.

Which of the following reactions defines $\Delta H_f^o$?

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