The standard molar enthalpies of formation of Pb2CrO5(s) and Pb5CrO8(s) by acid solution calorimetry
Sulata Kumari Sahu a, Rajesh Ganesan a, T.G. Srinivasan b, T. Gnanasekaran a,⇑
a Liquid Metals and Structural Chemistry Division, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
b Fuel Chemistry Division, Chemistry Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, India
a b s t r a c t
The standard molar enthalpies of formation, Deltaf Hm (298.15 K) of Pb2CrO5(s) and Pb5CrO8(s) were deter-mined using an isoperibol calorimeter. The enthalpies of solution of pure compounds, viz., Pb2CrO5(s), and Pb5CrO8(s) as well as mixtures viz., {PbCrO4(s) + PbO(s)} and {PbCrO4(s) + 4PbO(s)} in HNO3 (aq 8 mol. dm-3) at T 298.15 K were measured. Using these values, Deltaf Hm (298.15 K) of Pb2CrO5(s) and Pb5CrO8(s) were determined as -(1171.5 +- 1.7) kj.mol -1 and -(1850.6+-8.7) kj.mol -1, respectively.
Keywords:
Acid solution calorimetry Enthalpy of formation Lead chromates
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