Classify each of the following as exothermic or endothermic and give the ΔH for each:
a. CH4(g) + 2O2(g) CO2(g) + 2H2O(g) + 802 kJ
b. Ca(OH)2(s) + 65.3 kJ → CaO(s) + H2O(l)
c. 2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe (l) + 850 kJ
The thermite reaction of aluminum and iron(III) oxide produces very high temperatures used to cut or weld railroad tracks.
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