Enthalpy let's look at a couple of scenarios depicted in Figure 3.1 of the text as an example a mole of palmitic acid, a fatty acid, is oxidized completely to CO2 and water: palmitate( solid ) + 23 O 2 ( gas ) 16CO 2 ( gas ) + 16H 2 O( liquid ) there are two ways you can do this experiment, where you change one variable at a time, the pressure or the volume, at the sane time as you measure the heat given off to the system if the volume of the system is kept contstant, no work is done, and the entire energy change of the reaction is in the form of heat, so: delta E = q it turs out that the change in energy observed for this reaction is -9941.4 kJ/mol why is the sign negative?
(you; can do; this experiment, where you change one variable at a time) (you; change; one variable; T:at a time) (the volume of the system; is kept; ) (it; turs out; that the change in energy observed for this reaction) Context(it turs out,List([575, 586))):(no work; is done; T:at the sane time) Context(it turs out,List([575, 586))):(the change in energy; observed; for this reaction) (you; measure; the heat given off to the system) (a mole of palmitic acid; is oxidized; completely) (the entire energy change of the reaction; is; in the form of heat) (the heat; given off; to the system)
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