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Vapor pressure of methylammonium halides. Part II: Vapor pressure and standard entropy of methylammonium bromide

Author:
Ivanov, I.L., Mazurin, M.O., Tsvetkov, D.S., Malyshkin, D.A., Sereda, V.V., Zuev, A.Yu.
Source:
Thermochimica acta 2019 v.674 pp. 58-62
ISSN:
0040-6031
Subject:
enthalpy, entropy, halides, sublimation, temperature, vapor pressure
Abstract:
The equilibrium vapor pressure of methylammonium bromide was measured as a function of temperature in the range of 433–503 K. Standard enthalpy and entropy of sublimation of CH3NH3Br at 298.15 K and 1 atm were determined as (196.7 ± 2.8) kJ·mol−1 and (280.0 ± 5.6) J·mol−1 K−1, respectively. The measured value of sublimation enthalpy was found to be in agreement with that directly calculated from the available thermodynamic data. Standard entropy of the crystalline CH3NH3Br at 298.15 K was determined for the first time as (160.2 ± 5.6) J·mol−1 K−1.
Agid:
6345568