Are the following reactions exothermic or endothermic? Answer in order from a-c.a. CH4 (s) + O2 (g) –> CO2 (g) + 2 H2O (ℓ) ΔH = -890 kJb. 2 HCl (g) –> H2 (g) + 2 Cl2 (g) ΔH = +185 kJc. 4 NH3 (g) + 5 O2 –> 4 NO (g) + 6 H2O (ℓ) ΔH = -1169 kJ
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