Afeed stream containing 25 mole% methanol and 75 mole% water is separated in a continuous distillation column with a total reboiler and a partial condenser. the distillate has a methanol composition of 95 mole%. the methanol composition in the bottoms is 1 mole%. the column is operated at 1 atm.

a. what are the number of equilibrium stages required to do the separation if the feed is flashed to produce 50 mole% saturated liquid and 50% saturated vapor in the flash stage? assume the reflux ratio is 3.75 and you may assume the feed flowrate is 1000 kmol/hr.

b. what is l/d if the operating lines becomes simply yj+1 =xj

Astudent made a graph plotting the progress of a reaction over time. the student forgot to label the y-axis of the graph. a graph is shown with two graph lines. one graph line starts at a higher position on the y axis and slopes downwards towards the right. the other graph line starts at a lower position on the y axis and slopes upwards towards the right. the two graph lines stop short of intersecting each other and continue as separate lines which gradually become straight and parallel to the x axis. a vertical line is shown at a point where the two graph lines finally became parallel to the x axis. this vertical line is labeled equilibrium. the title on the x axis is time and an arrow pointing towards the right is shown above time. the title on the y axis is left blank. what best explains the label that the student should use on the y-axis? amount, because as the amount of product decreases, the amount of reactant increases over time. reaction rate, because forward and backward reaction become equal at equilibrium. amount, because the amounts of reactants and products become constant after equilibrium is reached. reaction rate, as the rate of forward reaction increases and rate of backward reaction decreases over time.

Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5

Amixture that has two or more substances that are spread out evenly is called a. compound b. heterogeneous c. substance d. homogeneous