Scienuk Posted August 3, 2016 Report Share Posted August 3, 2016 I am fully aware that that the spontaneity of a reaction when both the signs of the enthalpy change and the change in entropy of the system are equal is dependent on the temperature whether it's high or low, how am I supposed to know what's considered a high temperature and a low temperature. Is there a universal standard? or will it be significantly high or significantly low in the exam for me to distinguish. Thanks! Reply Link to post Share on other sites More sharing options...
kw0573 Posted August 3, 2016 Report Share Posted August 3, 2016 For the purpose of determining spontaneity, we solve set ΔG = 0 = ΔH - TΔS and solve for T, T = ΔH / ΔS. In case that T is a positive number, any temperature above T can be regarded as high temperatures, and below which is low. If T is 0 or negative then the distinction of high/low doesn't matter. Reply Link to post Share on other sites More sharing options...
Msj Chem Posted August 3, 2016 Report Share Posted August 3, 2016 (edited) There is no universal high and low temperature, it depends on the reaction. For example, the decomposition of calcium carbonate becomes spontaneous at temperatures above 1100 K. Edited August 4, 2016 by Msj Chem Reply Link to post Share on other sites More sharing options...
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