کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1251161 970890 2007 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Low-temperature Heat Capacities and Thermodynamic Properties of Hydrated Sodium Cupric Arsenate [NaCuAsO4· 1.5H2O(s)]
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Low-temperature Heat Capacities and Thermodynamic Properties of Hydrated Sodium Cupric Arsenate [NaCuAsO4· 1.5H2O(s)]
چکیده انگلیسی
Low-temperature heat capacities of the solid compound NaCuAsO4 · 1.5H2O(s) were measured using a precision automated adiabatic calorimeter over a temperature range of T = 78 K to T = 390 K. A dehydration process occurred in the temperature range of T = 368-374 K. The peak temperature of the dehydration was observed to be TD = (371.828 ± 0.146) K by means of the heat-capacity measurement. The molar enthalpy and entropy of the dehydration were ΔDHm = (18.571 ± 0.142) kJ/mol and ΔDSm = (49.946 ± 0.415) J/(K · mol), respectively. The experimental values of heat capacities for the solid (I) and the solid-liquid mixture (II) were respectively fitted to two polynomial equations by the least square method. The smoothed values of the molar heat capacities and the fundamental thermodynamic functions of the sample relative to the standard reference temperature 298.15 K were tabulated at an interval of 5 K.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Research in Chinese Universities - Volume 23, Issue 5, September 2007, Pages 574-578
نویسندگان
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