A) \[{{C}_{\text{diamond}}}+{{O}_{2}}(g)\xrightarrow{{}}C{{O}_{2}}(g)\]
B) \[\frac{1}{2}{{H}_{2}}(g)+\frac{1}{2}{{F}_{2}}(g)\xrightarrow{{}}HF(g)\]
C) \[{{N}_{2}}(l)+3{{H}_{2}}(g)\xrightarrow{{}}2N{{H}_{3}}(g)\]
D) \[CO(g)+\frac{1}{2}{{O}_{2}}(g)\xrightarrow{{}}C{{O}_{2}}(g)\]
Correct Answer: B
Solution :
\[\Delta H_{f}^{o}\]standard heat of formation, is the amount of heat evolved or absorbed when one gram mole of substance is formed from its constituent elements. For standard state, temperature is \[\text{25}{{\,}^{\text{o}}}\text{C}\]or \[\text{298}\,\text{K}\]and pressure of gaseous substance is 1 atm. Therefore, in given thermochemical equation, formation of HF represents the standard heat of formation of HF.
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