Energy Transfer and Conversion Methods
Chemical reactions either require or release heat. CH4 + 2 O2 → CO2 + 2 H2O Hrxn = -890 kJ/mol Exothermic reaction: one that gives off energy. Hrxn < 0. Endothermic reaction: one that requires energy. Hrxn > 0. Except in unusual situations (e.g. fuel cells, chemiluminescence) essentially all of the ΔHrxn is released or supplied as heat.
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