Recall that an energy or enthalpy diagram is usually read from left to right.
When energy is released → process is exothermic → ΔH < 0 or negative:
The complete combustion of ethanol, C2H5OH(l), to form H2O(g) and CO2(g) at constant pressure releases 1235 kJ of heat per mole of C2H5OH. Draw the correct enthalpy diagram for the reaction.
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