Heat transfer (45 pt). a single-pass counterflow shell-and- tube heat exchanger is used to warm up liquid glycerin. the heat exchanger comprises "n" tubes of 0.75" and 0.532" outer and inner diameter respectively, and 5m long. liquid glycerin enters the heat exchanger at 16 degc and exits at 60 degc. the mass flow rate of liquid glycerin processed is 5 kg/s. the process uses saturated steam at 1 atm (100 degc, enthalpy of vaporization 2257 kj/kg) on the shell side, which exits the heater as saturated liquid. the shell-side convective heat transfer coefficient can be assumed to be 5000 w/m2k to simplify calculations it can be assumed that the bulk velocity in each tube is 1.80 m/s, all tubes having the same heat transfer coefficient. it can also be supposed that the conductivity resistance of the tube is negligible determine: a) mass flow rate of steam, assuming all the steam is condensed (10 pt) b) log-mean temperature difference (5 pt) c) overall heat transfer coefficient, u (20 pt) d) area of the heat exchanger. how many tubes are required? (10 pt)

1.) which of the following is a molecule but not a compound? a.he b.f2 c.h2o d.ch4 2.) what is a physical combination of substances? a.a compound b.a molecule c.a mixture d.an element 3.) what is a chemical combination of substances? a.a compound b.an atom c.a mixture d.an element 4.) what is the relationship between the solute and solvent in a solution? a.they form a compound b.they form a mixture c.they form molecules d.they form chemical bonds 5.) the gases in air dissolve in water. what would be one way to reduce the amount of a gas dissolved in water? a.add more water b.reduce the air pressure c.increase the air pressure d.stir the water 6.) how would you determine the solubility of a substance? a.find how well it dissolved various substances. b.find the mass and the volume of the substance. c.find the temperature at which the substance evaporated. d.find how much i was able to dissolve in a solute. 7.) the periodic table organizes all of the kinds of a.molecules. b.compounds. c.atoms. d.ions. 8.)what distinguishes two substances combined to become a compound vs. two substances combined to become a mixture? a.whether they can be easily separated b.whether they chemically bond together c.whether they both are visible d.whether they are heterogeneous 9.) the principle components of air are: n2 78% o2 21% ar 0.95% co2 0.038% this is a solution of a.molecules and atoms. b.molecules. c.compounds and molecules. d.atoms.