4 NH3 (g) + 5 O2 (g) ? 4 NO (g) + 6 H2O (l) What type of reaction is this? Which side would you write "heat"? b. Consider: Consider the reaction in which 654 kJ of heat is absorbed: A + 2 B ? C What type of reaction is this? Which side would you write "heat"?
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The given reaction is a combustion reaction because it involves the reaction of a substance with oxygen to produce oxides. Since it is a combustion reaction, it is exothermic, meaning it releases heat. Show more…
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The heat of formation of $\mathrm{NH}_{3}(g)$ is $-46 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The $\Delta H$ (in $\mathrm{kJ} \mathrm{mol}^{-1}$ ) of the reaction, $2 \mathrm{NH}_{3}(g) \longrightarrow \mathrm{N}_{2}(g)+3 \mathrm{H}_{2}(g)$ is : (a) 46 (b) $-46$ (c) 92 (d) $-92$
Which of the following thermochemical equations can have $\Delta H_{\mathrm{f}}^{\circ}$ for the heat of the reaction? If it cannot, then why not? (a) $\mathrm{CO}\left(\mathrm{NH}_{2}\right)_{2}(a q) \longrightarrow \mathrm{CO}\left(\mathrm{NH}_{2}\right)_{2}(s)$ (b) $\mathrm{C}+\mathrm{O}+2 \mathrm{~N}+4 \mathrm{H} \longrightarrow \mathrm{CO}\left(\mathrm{NH}_{2}\right)_{2}(a q)$ (c) $\mathrm{C}(s,$ graphite $)+\frac{1}{2} \mathrm{O}_{2}(g)+\mathrm{N}_{2}(g)+4 \mathrm{H}_{2}(g) \longrightarrow$ $\mathrm{CO}\left(\mathrm{NH}_{2}\right)_{2}(a q)$ (d) $2 \mathrm{C}(s,$ graphite $)+\mathrm{O}_{2}(g)+2 \mathrm{~N}_{2}(g)+8 \mathrm{H}_{2}(g) \longrightarrow$ $2 \mathrm{CO}\left(\mathrm{NH}_{2}\right)_{2}(a q)$
Which of the following reactions is/are endothermic? a. $\mathrm{CO}_{2}(s) \rightarrow \mathrm{CO}_{2}(g)$ b. $\mathrm{NH}_{3}(g) \rightarrow \mathrm{NH}_{3}(l)$ c. $2 \mathrm{H}_{2}(g)+\mathrm{O}_{2}(g) \rightarrow 2 \mathrm{H}_{2} \mathrm{O}(g)$ d. $\mathrm{H}_{2} \mathrm{O}(l) \rightarrow \mathrm{H}_{2} \mathrm{O}(s)$ e. $\mathrm{Cl}_{2}(g) \rightarrow 2 \mathrm{Cl}(g)$
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