Chem. J. Chinese Universities ›› 1984, Vol. 5 ›› Issue (5): 599.

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The Measurements of Solution Heat for La(NO3)5·nH2O in Water and La(NO3)5·H2O in Alcohols

Guo Wei, Song Disheng, Liu Yilun   

  1. Department of chemistry, Northwest University, Xi'an
  • Received:1983-04-08 Online:1984-10-24 Published:1984-10-24

Abstract: The solution heats of La(NO3)5 ·nH2O (where n = 6,4,1,0) in water were measured calorimetrically at 25℃. Their values are 5.448 ±0.006, 1.415 ±0.004, -13.301 ±0.005 and - 20.330 ± 0.070 Kcal/mol, respectively. The standard formation heats of these compounds, and their enthalpies of dehydration and lattice energies were calculated. The solution heats. of La(NO3)5H2O in methanol, ethanol and n-pro,pyl alcohol were, measured calorimetrically at 25℃. Their values are - 19.086 ± 0.021, -14.362 ±0.054 and - 11.755±0.054 Kcal/mol,respectively.

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