Calculate the diffusion coefficient of ammonia (NH$_3$) in a mixture with the following composition: $y_{N_2} = 0.7$, $y_{O_2} = 0.1$ and $y_{NH_3} = 0.2$. The mixture is at $150^\circ\mathrm{C}$ and 2 bar. The following data are provided for $T = 293$ K and $P = 1$ bar: $D_{N_2-NH_3} = 2.441 \times 10^{-5}\ \mathrm{m^2/s}$ and $D_{O_2-NH_3} = 2.563 \times 10^{-5}\ \mathrm{m^2/s}$.

A very thin film of ethanol (A)-water (B) solution, with thickness of 0.4 cm, is at temperature of $20^\circ\mathrm{C}$ and one surface of the film is in contact with an organic liquid where the water is insoluble. The ethanol concentration in the interface with the organic liquid is 6.8% w/w and in the other side of the film is 16.8% w/w, with densities of $0.9881\ \mathrm{g/cm^3}$ and $0.9712\ \mathrm{g/cm^3}$ respectively. If the diffusion coefficient of the ethanol in the organic liquid is $0.74 \times 10^{-5}\ \mathrm{cm^2/s}$, then calculate in the steady state conditions the flux $N_A$. The molecular weights of ethanol and water are $M_A = 46.05$ and $M_B = 18.02$ g/mol respectively.