A) \[{{C}_{diamond}}+{{O}_{2}}(g)\xrightarrow{{}}C{{O}_{2}}(g)\]
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 :
\[\Delta H_{f}^{\text{o}}\], 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 \[{{25}^{o}}C\] or \[298\,\,K\] 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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