![]() The entropy of a closed system, determined. The latter data are fitted by the polynomial C-p = J K-1 mol(-1), which allows extrapolation to high temperatures. The third law provides an absolute reference point for the determination of entropy at any other temperature. ![]() The low-temperature heat-capacity data are compared with the DSC data obtained from 143 K to 775 K and show marginal differences in the common temperature range. ![]() A relative enthalpy increment of 22,119 J mol(-1) and an absolute entropy value of 127.13 +/- 0.25 J mol(-1) K-1 at 298.15 K are derived from the results. ![]() No phase transition was observed over this temperature range. The low-temperature heat capacity of epsilon-Mg2PO4OH was measured between 10 and 400 K by adiabatic calorimetry. Heat capacity, on the other hand, can have its absolute value determined experimentally, and it wont depend on a reference value like entropy does. Absolute Entropy, denoted as S, is the measure of disorder or randomness in a substance at an absolute zero temperature. ![]()
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