Có bao nhiêu phản ứng tỏa nhiệt trong số các phản ứng sau?
(1) \(\mathrm{N}_{2}\) (g) \(+3 \mathrm{H}_{2}\) (g) \(\longrightarrow 2 \mathrm{NH}_{3}\) (g)
\(\Delta_{\mathrm{r}} \mathrm{H}_{298}^{\mathrm{o}}=-92 \mathrm{~kJ}\)(2) \(\mathrm{H}_{2}(\mathrm{~g})+\mathrm{I}_{2}\) (g) \(\longrightarrow 2 \mathrm{HI}\) (g)
\(\Delta_{\mathrm{r}} \mathrm{H}_{298}^{\circ}=+11,3 \mathrm{~kJ}\)(3) Zn (s) \(+\mathrm{CuSO}_{4}(\mathrm{aq}) \longrightarrow \mathrm{ZnSO}_{4}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})\) \(\Delta_{\mathrm{r}} \mathrm{H}_{298}^{\circ}=-210 \mathrm{~kJ}\)
(4) \(\mathrm{HCl}(\mathrm{aq})+\mathrm{NaOH}(\mathrm{aq}) \longrightarrow \mathrm{NaCl}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}\)(1) \(\Delta_{\mathrm{r}} \mathrm{H}_{298}^{\circ}=-57,3 \mathrm{~kJ}\)
Giải thích:
(1) \(\mathrm{N}_{2}\) (g) \(+3 \mathrm{H}_{2}\) (g) \(\longrightarrow 2 \mathrm{NH}_{3}\) (g)
\(\Delta_{\mathrm{r}} \mathrm{H}_{298}^{\mathrm{o}}=-92 \mathrm{~kJ}\)(3) Zn (s) \(+\mathrm{CuSO}_{4}(\mathrm{aq}) \longrightarrow \mathrm{ZnSO}_{4}(\mathrm{aq})+\mathrm{Cu}(\mathrm{s})\) \(\Delta_{\mathrm{r}} \mathrm{H}_{298}^{\circ}=-210 \mathrm{~kJ}\)
(4) \(\mathrm{HCl}(\mathrm{aq})+\mathrm{NaOH}(\mathrm{aq}) \longrightarrow \mathrm{NaCl}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}\)(1) \(\Delta_{\mathrm{r}} \mathrm{H}_{298}^{\circ}=-57,3 \mathrm{~kJ}\)
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