ABSTRACT

The heat capacities of two samples of Na2MoO4, prepared by different methods, were measured at low temperatures. Obtained Cp0 data differ significantly (from 3 to 7% at temperatures 50-300 K) from literature ones. Smoothed values of thermodynamic functions (heat capacity, entropy, change of enthalpy and Gibbs energy) were calculated in the temperature range 0-300 K. At temperature 298.15 K standard values are: Cp0(298.15 K) = 132.2+-0.2 J K-1 mol-1, S0(298.15 K) = 149.9+-0.2 J K-1 mol-1, H0(298.15 K)-H0(0 K)=23.82+-0.02 kJ mol-1, S0(298.15 K)= 69.98+-0.24 J K-1 mol-1. Refined values of sodium molybdate entropy of formation and Gibbs energy of formation are: dfS0(Na2MoO4, 298.15 K) = -391.39 +- 0.60 J K-1 mol-1 and dfG0(Na2MoO4, 298.15 K) = -1351.0+-1.3 kJ mol-1, relatively.

Compounds

#	Formula	Name
1	MoNa2O4	sodium molybdate

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	191
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	60
POMD	1	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	37
POMD	1	Molar enthalpy, kJ/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	37
POMD	1	Molar entropy, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Vacuum adiabatic calorimetry	37

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Heat capacity and thermodynamic functions of Na2MoO4 in the temperature range 0-300 K

Gavrichev, K. S., Smirnova, N. N., Ryumin, M. A., Tyurin, A. V., Gurevich, V. M., Komissarova, L. N.

ABSTRACT