Chemical Reaction Engineering Quiz: First-order Reaction in Different Reactor Types
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Questions and Answers

For the multiple reactions 2A + R 2R + S, if initially there are 2 moles of A present and the number of moles of A and R at equilibrium are 0.3 and 0.5 respectively, what is the number of moles of S present?

  • 0.175 (correct)
  • 0.125
  • 0.225
  • 0.333
  • If the rate constant of a chemical reaction increases by a factor of 100 when the temperature is raised from 400 K to 500 K, and assuming the transition state theory is valid, what is the approximate value of the activation energy ($E_a$) divided by the gas constant ($R$)?

  • 8621 K
  • 8784 K
  • 9210 K (correct)
  • 8987 K
  • In the reaction A + B R + S, where R is the desired product and S is an unwanted side product, which combination of reactant concentrations should be used to maximize the conversion of A to R?

  • Any concentration of A, high concentration of B
  • Low concentration of A, low concentration of B
  • High concentration of A, any concentration of B
  • High concentration of A, low concentration of B (correct)
  • Given the rate data for the reaction A + B C + D at different temperatures, what is the approximate activation energy ($E_a$) of this reaction?

    <p>49 kJ/mol</p> Signup and view all the answers

    For the reaction A B conducted in an isothermal batch reactor, if the conversion of A increases linearly with holding time, what is the order of the reaction?

    <p>1 (first order)</p> Signup and view all the answers

    At elevated temperatures, acetaldehyde (CH$_3$CHO) undergoes a gas-phase decomposition reaction. What are the products of this reaction?

    <p>Methane (CH$_4$) and carbon monoxide (CO)</p> Signup and view all the answers

    In the reaction scheme: A + B R (desired product), with rate $r_1 = k_1 C_A C_B^2$, and A S (unwanted side product), with rate $r_2 = k_2 C_A$, which statement is correct?

    <p>A high concentration of B favors the formation of the desired product R.</p> Signup and view all the answers

    A reversible reaction A + B C + D is carried out in a constant-volume batch reactor. Which of the following statements is true?

    <p>The reaction quotient ($Q_c$) is equal to the equilibrium constant ($K_c$) at equilibrium.</p> Signup and view all the answers

    In a consecutive reaction A B C, if the rate constant for the first step ($k_1$) is much larger than the rate constant for the second step ($k_2$), what can be said about the concentration of the intermediate species B?

    <p>The concentration of B will be much larger than the concentrations of A and C.</p> Signup and view all the answers

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