Tutorial 3 solutions
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Tutorial 3 solutions. Lecturer: Miss Anis Atikah Ahmad Tel: +604 976 3245 Email: [email protected] Questions. Write the rate laws for the following reactions assuming each reaction follows an elementary rate laws . C 2 H 6 → C 2 H 4 + H 2

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Tutorial 3 solutions

Tutorial 3 solutions

Lecturer: Miss Anis Atikah Ahmad

Tel: +604 976 3245

Email: [email protected]


Questions

Questions

  • Write the rate laws for the following reactions assuming each reaction follows an elementary rate laws.

    • C2H6 → C2H4 + H2

    • (CH3)3COOC(CH3)3 ⇌ C2H6 + 2CH3COCH3

  • Write the rate law for the reaction:

    2A + B → C

    if the reaction

    • is second order in B and overall third order,

    • is zero order in A and first order in B

    • is zero order in both A and B

    • is first order in A and overall zero order


Tutorial 3 solutions

  • The formation of ortho-nitroanilineis formed from the reaction of ortho-nitrochlorobenzene(ONCB) and aqueous ammonia.

    The liquid-phase reaction is first order in both ONCB and ammonia with k= 0.0017 m3/kmol-min at 188°C with E = 11,273 cal/mol. The initial entering concentration of ONCB and ammonia are 1.8 kmol/m3 and 6.6 kmol/m3 respectively.

    • Write the rate law for the rate of disappearance of ONCB in terms of concentration.

    • Set up stoichiometric table for this reaction for a flow system.

    • Explain how part (a) and (b) would be different for a batch system.

    • Write –rAsolely as a function of conversion.

    • What is the initial rate of reaction (X=0) at 188°C and at 25°C?

    • What is the rate of reaction when X = 0.9 at 188°C and at 25°C?

    • What would be the corresponding CSTR volume at 25°C to achieve 90% conversion at 188°C for a feed rate of 2 dm3/min


Question 1

  • Write the rate laws for the following reactions assuming each reaction follows an elementary rate laws.

    • C2H6 → C2H4 + H2

    • (CH3)3COOC(CH3)3 ⇌ C2H6 + 2CH3COCH3

Question (1)

(a)

(b)

  • C2H6 → C2H4 + H2

  • A → B + C

  • (CH3)3COOC(CH3)3 ⇌ C2H6 + 2CH3COCH3

  • A ⇌ B + 2C


Question 2

  • Write the rate law for the reaction:

    2A + B → C

    if the reaction

    • is second order in B and overall third order

    • is zero order in A and first order in B

    • is zero order in both A and B

    • is first order in A and overall zero order

Question (2)

(a)

(b)

(c)

(d)


Question 3 a

Question (3)(a)

The formation of ortho-nitroanilineis formed from the reaction of ortho-nitrochlorobenzene(ONCB) and aqueous ammonia.

The liquid-phase reaction is first order in both ONCB and ammonia with k= 0.0017 m3/kmol-min at 188°C with E = 11,273 cal/mol. The initial entering concentration of ONCB and ammonia are 1.8 kmol/m3 and 6.6 kmol/m3 respectively.

  • Write the rate law for the rate of disappearance of ONCB in terms of concentration.

    Let A = ONCB, B = NH3, C = Nitroaniline , D = NH4Cl


Question 3 b

Question (3)(b)

A + 2B → C + D

  • Set up stoichiometric table for this reaction for a flow system


Question 3 c

Question (3)(c)

  • Explain how part (a) and (b) would be different for a batch system

    For batch system,


Question 3 d

Question (3)(d)

  • Write –rAsolely as a function of conversion.

    For liquid phase rxn, υ= υ0


Question 3 d1

Question (3)(d)

Substituting the concentration of A & B;


Question 3 e

Question (3)(e)

---(1)

  • What is the initial rate of reaction (X=0) at 188°C and at 25°C

    i) At T= 188°C, k =0.017m3/kmol-min

    Substituting X=0 and k =0.017m3/kmol-min into (1);


Question 3 e1

Question (3)(e)

---(1)

  • What is the initial rate of reaction (X=0) at 188°C and at 25°C

    ii) At T= 25°C (298.15 K), k =? m3/kmol-min

    Find k at T =25°C first

    k at initial T is

    k at any temperature is

    Taking the ratio;


Question 3 e2

Question (3)(e)

---(1)

  • What is the initial rate of reaction (X=0) at 188°C and at 25°C

    ii) Now we know that, at T= 25°C (298.15 K), k = 2.039 x 10-6 m3/kmol-min

    Therefore, we can calculate –rA at 25° by susbtituting

    k= 2.039 x 10-6m3/kmol-min, and X = 0 in eq (1).


Question 3 f

Question (3)(f)

---(1)

  • What is the rate of reaction when X = 0.9 at 188°C and at 25°C?

    (i) At T= 188°C, k =0.0017m3/kmol-min

    Substituting X=0.9 and k =0.017m3/kmol-min into (1);


Question 3 f1

Question (3)(f)

---(1)

  • What is the rate of reaction when X = 0.9 at 188°C and at 25°C?

    (ii) From part (e) when T= 25°C, k = 2.039 x 10-6 m3/kmol-min

    Substituting X=0.9 and k = k = 2.039 x 10-6 m3/kmol-min into (1);


Question 3 g

Question (3)(g)

  • What would be the corresponding CSTR volume at 25°C to achieve 90% conversion at 188°C for a feed rate of 2 dm3/min?

    Substituting the value of CA0, υ0 and –rA(at 288°C & X=0.9);


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