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Based on the enthalpy changes given for the reactions, which reactions are endothermic?

2H2O → 2H2 + O2, ΔH = 484 kJ
C + O2 → CO2, ΔH = -394 kJ
H2 + Br2 → 2HBr, ΔH = -73 kJ
2NH3 → N2 + 3H2, ΔH = 92 kJ

Sagot :

[tex]\\ \sf\ast\Rrightarrow 2H_2O\longrightarrow 2H_2+O_2,\Delta H=484J[/tex]

[tex]\\ \sf\ast\Rrightarrow 2NH_3\longrightarrow N_2+3H_2,\Delta H=92J[/tex]

  • Note it down

[tex]\\ \sf\ast\Rrightarrow \Delta H=+ve(Endothermic)[/tex]

[tex]\\ \sf\ast\Rrightarrow \Delta H=-ve(Exothermic)[/tex]

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