Thermochemistry of uranium compounds. V. Standard enthalpies of formation of the monouranates of lithium, potassium, and rubidium

Journal Article · Tue Jan 01 04:00:00 EST 1974 · J. Chem. Thermodyn., v. 6, pp. 1161-1169

DOI:https://doi.org/10.1016/0021-9614(74)90152-9· OSTI ID:4024605

O'Hare, P A.G.; Hoekstra, H R

Enthalpies of reaction, $delta$H/sub r/, of the monouranates of lithium, potassium, and rubidium with 1 mol dm$sup -3$ HCl were measured calorimetrically as --(41.77 +- 0.02), --(42.07 +-- 0.05), and --(41.30 +- 0.05) kcal/sub th//mol, respectively. From these measurements, and auxiliary determinations of the enthalpies of solution in acid of the chlorides of lithium, potassium, and rubidium and of uranyl chloride, the standard enthalpies of formation of the uranates, $delta$$H$$sup 0$/sub f/, have been derived as --(463.31 +- 0.84), -- (451.39) +- 0.83), and --(452.00 +-- 0.85) kcal/sub th//mol for $alpha$--Li$sub 2$UO$sub 4$, K$sub 2$UO$sub 4$, and Rb$sub 2$UO$sub 4$, respectively. The values of $delta$H/sub r/ and $delta$$H$$sup 0$/sub f/ differ significantly from those of the only previous study. (auth)

• Research Organization: Argonne National Lab., IL
• NSA Number: NSA-33-025503
• OSTI ID: 4024605
• Journal Information: J. Chem. Thermodyn., v. 6, pp. 1161-1169, Journal Name: J. Chem. Thermodyn., v. 6, pp. 1161-1169; ISSN JCTDA
• Country of Publication: United Kingdom
• Language: English

Related Subjects

*LITHIUM URANATES-- FORMATION HEAT
*POTASSIUM URANATES-- FORMATION HEAT
*RUBIDIUM URANATES-- FORMATION HEAT
400702* --Chemistry--Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
HYDROCHLORIC ACID
N40420* --Chemistry--Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
SYNTHESIS