Title: Thermodynamic study of Cs3Na(MoO4)2: determination of the standard enthalpy of formation and standard entropy at 298.15 K
Authors: SMITH ANNAPIGNIE M.-C.VAN EIJCK L.GRIVEAU JEAN-CHRISTOPHECOLINEAU ERICKONINGS RUDY
Citation: JOURNAL OF CHEMICAL THERMODYNAMICS vol. 120 p. 205-216
Publisher: ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
Publication Year: 2018
JRC N°: JRC108037
ISSN: 0021-9614
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC108037
DOI: 10.1016/j.jct.2018.01.016
Type: Articles in periodicals and books
Abstract: The enthalpy of formation at 298.15 K and low temperature heat capacity of Cs3Na(MoO4)2 have been measured for the first time in this work using solution calorimetry and thermal-relaxation calorimetry in the temperature range T=(1.9-304.8) K, respectively. The solution calorimetry measurements, performed in 2 M HNO3 solution, have yielded an enthalpy equal to delta rHm(298.15K) = (6.79 +/- 1.72) kJmol-1 for the reaction: 3/2Cs2MoO4(cr) + 1/2Na2MoO4(cr) = Cs3Na(MoO4)2(cr) Combining with the enthalpies of formation of Cs2MoO4(cr) and Na2MoO4(cr), also determined in this work in 0.1 M CsOH and 0.1 M NaOH solutions, respectively,the standard enthalpy of formation of Cs3Na(MoO4)2 at 298.15 K has been determined as delta fHom(Cs3Na(MoO4)2, cr, 298.15 K) = -(2998.6 +/- 2.9)kJmol-1. The heat capacity and entropy values of Cs3Na(MoO4)2 at 298.15 K have been derived as Cop,m(Cs3Na(MoO4)2; cr; 298:15K) = (296:3 +/- 3:0) JK-1mol-1 and Som(Cs3Na(MoO4)2; cr; 298:15K) = (467:2 +/- 6:3) JK-1mol-1. Combining the newly determined thermodynamic functions, the Gibbs energy of formation of Cs3Na(MoO4)2 at 298.15 K has been derived as delta fGom(Cs3Na(MoO4)2; cr; 298:15K) = -(2784:7 +/- 3:2) kJmol-1. Finally, the enthalpies, entropies and Gibbs energies of formation of Cs3Na(MoO4)2 from its constituting binary and ternary oxides have been calculated.
JRC Directorate:Nuclear Safety and Security

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