iran-konkur 2019 Q219

iran-konkur · Other · konkur-riazi_1398_specialized_new-curriculum Not Maths
219. Considering the figure below, if the bond energies of $\text{N}=\text{O}$, $\text{N}\equiv\text{N}$, and $\text{O}=\text{O}$ are respectively 944, 607, and 496 kJ/mol, what is the sum of $\Delta H$ and $E_a$ (in kJ) per mole for the forward reaction shown?
[Figure: Reaction energy diagram showing 2NO as reactants, a transition state at 381 kJ, and $\text{N}_2 + \text{O}_2$ as products, with $\Delta H(\text{kJ})$ indicated]
  • [(1)] $+155$
  • [(2)] $+187$
  • [(3)] $+441$
  • [(4)] $+607$
\textbf{219.} Considering the figure below, if the bond energies of $\text{N}=\text{O}$, $\text{N}\equiv\text{N}$, and $\text{O}=\text{O}$ are respectively 944, 607, and 496 kJ/mol, what is the sum of $\Delta H$ and $E_a$ (in kJ) per mole for the forward reaction shown?

\textit{[Figure: Reaction energy diagram showing 2NO as reactants, a transition state at 381 kJ, and $\text{N}_2 + \text{O}_2$ as products, with $\Delta H(\text{kJ})$ indicated]}

\begin{itemize}
\item[(1)] $+155$
\item[(2)] $+187$
\item[(3)] $+441$
\item[(4)] $+607$
\end{itemize}