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Molar Gibbs Energy of Formation of BaMo2O7(s) Using the Solid Oxide Galvanic Cell Method

✍ Scribed by Ziley Singh; Smruti Dash; Rajendra Prasad; V. Venugopal

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 236 KB
Volume: 134
Category: Article
ISSN: 0022-4596
DOI: 10.1006/jssc.1997.7617

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✦ Synopsis

f G°(BaMo 2 O 7 , s, T ) has been determined using the emf technique. The cell used was: (-)Pt/(BaMo 2 O 7 (s)؉BaMoO 4 (s) ؉MoO 2 (s))//CSZ//air (p(O 2 (g) ‫؍‬ 21.21 kPa)/Pt(؉). The observed emfs in the temperature range 828-985 K could be represented by E ‫؍‬ 0.7663 ؊ 4.953؋10

؊4 T (؎0.001) V. The standard molar Gibbs energy of formation of BaMo 2 O 7 (s) was evaluated from emf values and the f G°(T) of BaMoO 4 (s) and MoO 2 (s). The corresponding expression is given as f G°(BaMo 2 O 7 , s, T )‫3716.0؉7.9622؊؍‬T (؎5.1) kJ mol ؊1 . Using the required literature values, the f H°(BaMo 2 O 7 , s, 298.15 K) was calculated by the second-law method and the corresponding value is !2291.2 kJ mol ؊1 . The present study is the first experimental work for the determination of f G°(BaMo 2 O 7 , s, T ).

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