The standard enthalpies of formation of uranium compounds. XV. Strontium uranates

✍ Scribed by E.H.P. Cordfunke; A.S. Booij; M.E. Huntelaar

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 117 KB
• Volume: 31
• Category: Article
• ISSN: 0021-9614
• DOI: 10.1006/jcht.1999.0545

✦ Synopsis

Enthalpies of solution of the uranates of strontium have been measured calorimetrically in 5.075 mol • dm -3 HCl(aq), or in (1.00 mol • dm -3 HCl + 0.0470 mol• dm -3 FeCl 3 )(aq). The results have been combined with auxiliary values to derive the standard molar enthalpies at T = 298.15 K. With the results obtained and recalculated values from the literature, the following values for f H o m /kJ • mol -1 have been obtained: Sr 3 U 11 O 36 , -(15900 ± 17); Sr 2 U 3 O 11 , -(5236.4 ± 4.8); β-SrUO 4 , -(1985.1 ± 1.4); Sr 5 U 3 O 14 , -(7265.8 ± 7.5); Sr 2 UO 5 , -(2626.9 ± 2.0); Sr 3 UO 6 , -(3252.4 ± 2.1); Sr 2 UO 4.5 , -(2488.0 ± 2.5).