Related Experiment Video
Updated: Jan 2, 2026

Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
Published on: July 27, 2022
Vapor Pressure and Heat of Sublimation of Rhenium
1Institute for Materials Research, National Bureau of Standards, Washington, D.C.
Abstract:
The vapor pressure of rhenium was measured by the Langmuir method in the temperature range 2350-3050 °K using a vacuum microbalance. The least squares line through the four series of data points is 4.5756 log P(atm) = 32.26 - 180700/T. Least squares lines for each of the four series yield heats and entropies of sublimation higher than the corresponding third law values. The vapor pressure equation based on the average heat and entropy is, 4.5756 log P(atm) = 33.36 - 183500/T. The selected third law heat of sublimation, (298) is 185.9 kcal mol-1. Our recommended equation for the vapor pressure is 4.5756 log P (atm) = 31.86 - 180200/T based on our mean third law heat and tabulated values for the entropies and enthalpies.
Related Concept Videos
Phase Transitions: Sublimation and Deposition
Clausius-Clapeyron Equation
Sublimation
Vapor Pressure
Phase Transitions: Vaporization and Condensation
Vaporization

