Question
Calculate the standard enthalpy of formation of $\mathrm{N}_{2} \mathrm{O}_{8}(\mathrm{g})$ from the following data\[\begin{aligned}\mathrm{N}_{2}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{g}) \rightarrow 2 \mathrm{NO}(\mathrm{g}) & & 4 \mathrm{H}^{\circ} &=-180.5 \mathrm{kJmol}^{-1} \\2 \mathrm{NO}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{g}) & \rightarrow 2 \mathrm{NO}_{2}(\mathrm{g}) & & 4 \mathrm{H}^{\prime}=-114.4 \mathrm{kJmol}^{-1} \\2 \mathrm{N}_{2} \mathrm{O}_{5}(\mathrm{g}) & \rightarrow 4 \mathrm{NO}_{2}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{g}) & \Delta H^{6} &=-110.2 \mathrm{kJmol}^{-1}\end{aligned}\]
Step 1
The equation is: \[2\mathrm{N}_{2}(\mathrm{g})+5\mathrm{O}_{2}(\mathrm{g}) \rightarrow \mathrm{N}_{2} \mathrm{O}_{8}(\mathrm{g})\] The standard enthalpy change for this reaction, $\Delta H^{\circ}$, is what we want to find. Show more…
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Calculate the standard molar enthalpy of formation of $\mathrm{NO}(g)$ from the following data: $$\begin{array}{ll} \mathrm{N}_{2}(g)+2 \mathrm{O}_{2} \longrightarrow 2 \mathrm{NO}_{2}(g) & \Delta H^{\circ}=66.4 \mathrm{kJ} \\ 2 \mathrm{NO}(g)+\mathrm{O}_{2} \longrightarrow 2 \mathrm{NO}_{2}(g) & \Delta H^{\circ}=-114.1 \mathrm{kJ} \end{array}$$
Calculate the standard molar enthalpy of formation of $\mathrm{NO}(g)$ from the following data: $$\begin{array}{ll}{\mathrm{N}_{2}(g)+2 \mathrm{O}_{2} \longrightarrow 2 \mathrm{NO}_{2}(g)} & {\Delta H_{298}^{\mathrm{o}}=66.4 \mathrm{kJ}} \\ {2 \mathrm{NO}(g)+\mathrm{O}_{2} \longrightarrow 2 \mathrm{NO}_{2}(g)} & {\Delta H_{298}^{\circ}=-114.1 \mathrm{kJ}}\end{array}$$
Calculate the standard enthalpy of formation of $\mathrm{SO}_{2}(g)$ from the standard enthalpy changes of the following reactions: $$\begin{aligned} 2 \mathrm{SO}_{2}(g)+\mathrm{O}_{2}(g) \rightarrow 2 \mathrm{SO}_{3}(g) & & \Delta H_{\mathrm{rxn}}^{\circ}=-196 \mathrm{kJ} \\ \frac{1}{4} \mathrm{S}_{8}(s)+3 \mathrm{O}_{2}(g) \rightarrow 2 \mathrm{SO}_{3}(g) & & \Delta H_{\operatorname{man}}^{\circ}=-790 \mathrm{kJ} \\ \frac{1}{8} \mathrm{S}_{8}(s)+\mathrm{O}_{2}(g) \rightarrow \mathrm{SO}_{2}(g) & \Delta H_{5}^{\circ} &=? \end{aligned}$$
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