Afeed of 22.2 mole% ethanol and the balance water, at 1 atm and an enthalpy of 4,860 btu/lbmole, is to be separated by distillation in a plate column with open steam (at an enthalpy of 1,200 btu/1b) and a partial condenser. the bottom product is to contain 3.8 mole% ethanol and the distillate product (saturated vapour) 78 mole% ethanol. 10.0 lb of steam are used per lbmole of feed. (a) what is the condenser duty per mole of distillate product? (b) what are the co-ordinates of the δ point associated with the bottom of the column? (c) how many ideal stages are required? (d) how many actual plates are required, if the partial condenser is equivalent to one ideal plate and the rest of the tower has an overall efficiency of 75%?

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence,   the electronegativity (or the ability to attract electrons) is lessened."

c, liquids evaporate, creating a gas

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.

може ли да зареждате повече информация, моля