Aliquid mixture containing 30.0 mole% benzene (b), 25.0 mole% toluene (t), and the balance xylene (x) is fed to a distillation column. the bottoms product contains 98.0 mole% x and no b; 96.0 mole% of the x in the feed is recovered in this stream. the overhead product is fed to a second column. the overhead product from the second column contains 97.0 mole% of the b in the feed to this column. the composition of this stream is 94.0 mole% b and the balance t.

calculate

(i) the percentage of the benzene in the process feed that emerges in the overhead product from the second column and

(ii) the percentage of toluene in the process feed that emerges in the bottom product from the second column.

Hot air balloons float in the air because of the difference in density between cold and hot air. in this problem, you will estimate the minimum temperature the gas inside the balloon needs to be, for it to take off. to do this, use the following variables and make these assumptions: the combined weight of the pilot basket together with that of the balloon fabric and other equipment is w. the volume of the hot air inside the balloon when it is inflated is v. the absolute temperature of the hot air at the bottom of the balloon is th (where th> tc). the absolute temperature of the cold air outside the balloon is tc and its density is ďc. the balloon is open at the bottom, so that the pressure inside and outside the balloon is the same. as always, treat air as an ideal gas. use g for the magnitude of the acceleration due to gravity.

For each of the following types of reactions, write a general reaction formula in the symbolic form—for example, a + b → ab. single-displacement double-displacement synthesis decomposition

Three alkali metals in group 1 are a. calcium, strontium, barium b. boron, aluminum, gallium c. sodium, potassium, rubidium d. fluorine, iodine, chlorine