Classify the same processes as exothermic or endothermic.
Evaporation of alcohol from skin: liquid C3H30 + 5.2 kJ → vaporized C3H30
Burning of propane in a gas grill: C3H8 + 502 - 3C02 + 4H20 + 1652 kJ
Oxidation of iron to form rust 4Fe + 30, 2Fe2O3 + 2221 kJ
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