Electrical conductance can vary with the direction of the crystalline structure in anisotropic crystals. Some directions may allow for better electrical conductivity, while others may hinder the flow of electricity.
Thermal conductance, also known as thermal conductivity, can also vary with the direction of the crystalline structure in anisotropic crystals. Different crystallographic directions may have different thermal conductivities.
Molar mass is a property of a substance and does not depend on the direction of the crystalline structure. It remains constant for a given compound regardless of its crystalline form.
Refractive index can vary with the direction of the crystalline structure in anisotropic crystals. Different crystallographic directions may result in different refractive indices, leading to optical anisotropy.
The property that does not change with the change in the direction of crystalline structure in anisotropic crystals is C. Molar mass. Molar mass is an intrinsic property of a substance and remains constant for that substance, regardless of its crystalline orientation.