Gas Heat Capacity and Internal Rotation in 1,2-Dichloroethane and 1,2-Dibromoethane

The gas heat capacity of 1,2-dichloroethane was measured in the temperature interval from 356°K to 556°K. The gas heat capacity of 1,2-dibromoethane was measured in the temperature interval from 383°K to 473°K. A potential barrier to internal rotation for 1,2-dichloroethane was selected which is in agreement with all of the data on heat capacity, entropy, and dipole moment of the gaseous molecule. An approximate barrier to internal rotation was selected for 1,2-dibromoethane.