Print Email Facebook Twitter Thermodynamic study of Cs3Na(MoO4)2 Title Thermodynamic study of Cs3Na(MoO4)2: Determination of the standard enthalpy of formation and standard entropy at 298.15 K Author Smith, A.L. (TU Delft RST/Reactor Physics and Nuclear Materials) Pignié, M.C.F.C.O. (PSL Research University) van Eijck, L. (TU Delft RST/Neutron and Positron Methods in Materials) Griveau, Jean Christophe (European Commission) Colineau, Eric (European Commission) Konings, R. (European Commission) Date 2018 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 = (1.9–299.6) K, respectively. The solution calorimetry measurements, performed in 2 M HNO3 solution, have yielded an enthalpy equal to ΔrHmΔrHm(298.15 K) = (6.79 ±± 1.72) kJ··mol−1 for the reaction:3/2Cs2MoO4(cr)+1/2Na2MoO4(cr)=Cs3Na(MoO4)2(cr)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 View the MathML sourceΔfHmo(Cs3Na(MoO4)2, cr, 298.15 K) = −(2998.5 ±± 3.0) kJ··mol−1. The heat capacity and entropy values of Cs3Na(MoO4)2 at 298.15 K have been derived as View the MathML sourceCp,mo(Cs3Na(MoO4)2,cr,298.15K)=(296.3±3.3) J··K−1··mol−1 and View the MathML sourceSmo(Cs3Na(MoO4)2,cr,298.15K) (467.2±6.8) J··K−1··mol−1. Combining the newly determined thermodynamic functions, the Gibbs energy of formation of Cs3Na(MoO4)2 at 298.15 K has been derived as View the MathML sourceΔfGmo(Cs3Na(MoO4)2,cr,298.15K)=-(2784.6±3.4) kJ··mol−1. Finally, the enthalpies, entropies and Gibbs energies of formation of Cs3Na(MoO4)2 from its constituting binary and ternary oxides have been calculated. Subject Solution calorimetryThermal-relaxation calorimetryDouble molybdatesCesium molybdateSodium molybdate To reference this document use: http://resolver.tudelft.nl/uuid:09239b36-ba63-45ca-a16b-b304dd5633e4 DOI https://doi.org/10.1016/j.jct.2018.01.016 ISSN 0021-9614 Source The Journal of Chemical Thermodynamics, 120, 205-216 Part of collection Institutional Repository Document type journal article Rights © 2018 A.L. Smith, M.C.F.C.O. Pignié, L. van Eijck, Jean Christophe Griveau, Eric Colineau, R. Konings Files PDF 23022018_van_eijck.pdf 867.19 KB Close viewer /islandora/object/uuid:09239b36-ba63-45ca-a16b-b304dd5633e4/datastream/OBJ/view