true or false, help

1.JA is a vector representing the molar diffusion flux of species A with respect to a fixed reference frame. 2. JA is a vector representing the mass diffusion flux of species A with respect to a fixed reference frame. 3. Vectors vA and VA are equal when diffusion is steady-state. 4. The Maxwell-Stefan equations are constitutive equations. 5. The thermodynamic factor has units of [m2/s]. 6. The driving force for mass transfer due to diffusion is a temperature gradient. 7. The molecular diffusion coefficient of gases at low pressure is independent of pressure. 8. The diffusivity of gases at low pressure is independent of pressure. 9. The Wilke-Lee equation is recommended to be used to estimate the diffusivity of gaseous binary mixtures at high pressures. 10. The Wilke-Chang equation is recommended to be used to estimate the diffusivity of gaseous binary mixtures at low pressures. 11. Diffusivities of liquids are several orders of magnitude smaller than gas diffusivities. 12. The four types of steady-state diffusion in solids are: ordinary molecular diffusion, Knudsen diffusion, surface diffusion, and hydrodynamic diffusion. 13. Schmidt number is a dimensionless group defined as the ratio of thermal diffusivity and mass diffusivity