Adistillation column with a total condenser and a partial reboiler is separating acetone and ethanol mixture. there are two feeds. one feed is 50,0 mol% acetone, flows at 100.0 mol/min, and is a saturated liquid. the other feed is a saturated liquid, flows at 150.0 mol/min and is 35.0 mol% acetone. we desire a distillate product that is xd fraction acetone and a bottoms product that is xb ratio is 2. the column operates at a pressure of 1,0 atm. assume cmo and use a mccabe- thiele diagram. if each stage has a locations for each feed and the actual required number of stages. the equilibrium data for this system is shown in figure 1. - 36 0.85 mole 0.10 mole fraction acetone. the reflux murphree efficiency of 0.75, find optimum feed

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

it would be b. 6co2 + 6h2o --> c6h12o6 + 6o2

35. a insulated cylinder of solid gold (k 310 kw/m-k) of radius v2 m and height 5 m is heated at one end until the temperature at each point in the cylinder is given by w(r, y, z) (30 z2)(2-(r2+ y2). determine the rate of heat flow across each horizontal disk given by z 1, z 2, and z 3, identifying which has the greatest rate of heat flow across it.

explanation: