Chapter 3 Self Test

Old Exam Questions

The elementary gas phase reaction

takes place isothermally in a flow reactor with no pressure drop. The feed is equal molar in A and B. Write the rate of reaction, -r_A, solely as a function of the conversion, X [i.e. -r_A = f(X)].

Hint 1: What is the rate law?

Hint 2: What is e?

Hint 3: What is C_A as a function of X?

Hint 4: What is C_B as a function of X?

Solution

Remember that the rate law for gases includes volume change. 

Back to Problem 

Back to Problem 

What is C_A as a function of X?

Back to Problem

What is C_B as a function of X?

From the stoichiometry: b/a = 1/2

Equal Molar: 

Back to Problem

We see species A is the limiting reactant as the feed is equal molar in A and B, but one mole of B consumes two moles of A.  

Need to put everything in terms of per mole of limiting reactant A.

From the stoichiometry: b/a = 1/2

Equal Molar:

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