Thermal Chemistry

I'm having problems understanding the ideas in the topic of thermal chemistry and would appreciate any sort of overview of the main concepts you could provide.

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...hat you can check the answer - making sure to study the different uses of the above terms.
Think about a general reaction:
a*A + b*B ---> c*C + d*D

a, b, c, and d are the stoichiometric coefficients. A, B, C, and D are the chemical compounds involved in the reaction. If we talk about the change in energy during, or as a result of this reaction, we would use one of the above terms (delta G, delta H, delta A) depending on the condition that the reaction was run (constant P, constant P & V, contant V).

Another key point for all of this is the sign of the energy change. For example, let's assume that for our above reaction, we're running it under constant pressure & temperature, and that all the coefficients (a,b,c,d) are equal to 1. Then it might have a value of the change in enthalpy:
delta_H = -100 kJ/mol
The negative sign means that the change in enthalpy, going from reactants to products, is 100 kilojoules, for every 1 mol of each reactant consumed or reactant produced. Another way of looking at this is to re-write the chemical ...