Murphree efficiency and actual number of trays. for the

distillation of heptane and ethyl benzene in problem 11.4-2, the

murphree tray efficiency is estimated as 0.55. determine the actual

number of trays needed by stepping off the trays using the tray

efficiency of 0.55. also, calculate the overall tray efficiency

eo.

The allotropes of carbon include a variety of structures that include three-dimensional tetrahedral lattices, planes of hexagonal rings, cylindrical tubes of hexagonal rings, and spheres of five- and six-membered rings. similar shapes of network covalent atomic solids are possible with carbon nitride, boron, and pure silicon (e. g., silicene is a graphene-like allotrope of pure silicon). in contrast, silicates exist as either highly ordered or amorphous (more random) three-dimensional lattices. what could explain why there are there no naturally occurring sheets, stacked sheets, cylindrical tubes, or spheres of network covalent atomic solids composed of silicon and oxygen (sio2)? would pure silicate structures make good lubricants or good electrical conductors?