3- The critical constants of ethane are pc = 48.20 atm, Vc =148cm³mol, and Tc = 305.4 K. a) Calculate the van der Waals parameters of the gas %3D b) estimate the radius of the molecules.

1. An ideal solution containing 0.1x10-3 m3 of methanol and 0.9x10-3 m3 of benzene moves at a molar average velocity of 0.12 m/s. If the molar flux of benzene relative to the mass average velocity is -1.0 kgmol/m2-s, find the total molar flux of methanol, NA, and the mass average velocity. Assume the density of methanol is 792 kg/m3 and the benzene density is 879 kg/m3.

Aluminium (Al) has a face-centered cubic structure, with lattice parameter a = 4.05 × 10^−10 m. Ifeach Al atom loses three electrons to make a free electron gas in the metal, what is the electrondensity ne?

Determine the supersaturation ratio, S, required to permit 0.5-mmdiameter crystals ofsucrose (MW = 342 and ρc = 1,590 kg/m3) to grow if σs,L = 0.01 J/m2. Assume the temperature is 25°C.