3. * * (20%) True (T) or false (F) a. For an irreversible reaction aA+bB-eC+dD,

Question

3. * * (20%) True (T) or false (F) a. For an irreversible reaction aA+bB-eC+dD, the reaction rate can be expressed as-k ,this scalled the power law of reaction b The reaction rate constant of the above reaction, k is not a constant. It depends on the temperature and a few other factors c. For an elementary reactiona A +bBcC+d D, the reaction rate constants for the different reactants (k, and kg ) are the same d. For the reaction A+ 2BC+ D,2 moles of B will be consumed when mole of A is consumed. Therefore, B is always the limiting reactant when we cakulate the stoichiometry For a system with a reaction ABCtaking place, as shown below, the mole balance equation is FAs F e. F+F F f. e",and this The equation describing a plug flow reactor PFR) isv- equation is independent of the shape of the PFR & The equation in the above statement can be further calculated as h. Levenspiel plot is a plot of the relationship between and conversion. can be obtained only from experimental data or Iiterature. L For a typical reaction with a positive activation energy, the reaction rate constant increases when temperature increases. Therefore, the volume ofa CSTR required to achieve a certain conversion will be smaler at a higher i For a gas phase reaction in a flow reactor, if the temperature and pressure are kept constant, then we can ignore the change of the volumetric flow rate because PVNRT 4" (10%) For a reaction A create the Levenspiel plot shown as below. S/he aho found the volume of a PFR that is needed to achieve 80% conversion would be 80 Liters. B. an engineer did a set of experiments and used thesa to a. (2%)* * Please indicate on chart (a) how she obtained this 80user b. (2%)**Please indicate on chart (b) the volume needed for a CSTR to achieve 80% conversion (3%)**If you need to use two reactors (either CSTR or PFR)toacheve 80%final conversion, 40% for each reactor. How would you choose and arrange them, Pease mark the total volume on chart (c). .

Explanation / Answer

A. First statement is true

B. Rate constant is constant if you change the concentration of reactants but it will depend on temperature and catalyst. So, the statement is True

3.Statement is False. Rate constants are different

4.statement is false as one mole of A is consumed with 2 moles of B. If 2 mole of A are present then its in excess so it will not be limiting reagent.

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