A total feed of 200 mol/h having an overall composition of 42 mol% heptane and 58 mol% ethyl benzene is to be fractionated at 101.32 kPa abs pressure to give a distillate containing 97 mol% heptane and a bottoms containing 1.1 mol% heptane. The feed enters the tower partially vaporized so that 40 mol% is liquid and 60 mol% is vapor. Equilibrium data are given in the previous problem statement. Calculate the following: (a) Moles per hour distillate and bottoms (b) Minimum reflux ratio (c) Minimum stages at total reflux (d) Theoretical number of trays required for an

a. hope i'm right

explanation:

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.