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Thermochemistry is the study of the energy changes which occur during a chemi-cal reaction. For example, in the hydrolytic polymerization of Cr~(3+), Cr[Cr(OH)_2]~(4+),Cr[Cr(OH)_2]_2~(5+) and Cr[Cr(OH)_2]_3~(6+) were formed at concentration range of 0.005-0.04