Reaction kinetics worksheet with answers

Free printable Reaction kinetics worksheet: 6 problems from easy to exam level, with an answer key. Print it or save it as a PDF.

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1.Easy

A zero-order reaction A → products has a rate constant of 0.04 mol/(L·min). The initial concentration of A is 1.5 mol/L. Find the concentration C_A after 30 min.

k = 0.04 mol/(L·min)C_A0 = 1.5 mol/Lt = 30 min

C_A = mol/L

2.Easy

A first-order reaction A → products has a rate constant of 0.1 min⁻¹. The initial concentration of A is 1.5 mol/L. Find the concentration C_A after 5 min.

k = 0.1 min⁻¹C_A0 = 1.5 mol/Lt = 5 min

C_A = mol/L

3.Medium

A second-order reaction (−r_A = k·C_A²) in a batch reactor has k = 0.5 L/(mol·min) and starts at 1 mol/L. How long does it take to reach 80% conversion? Find t.

k = 0.5 L/(mol·min)C_A0 = 1 mol/LX = 80 %

t = min

4.Medium

A zero-order reaction has k = 0.04 mol/(L·min) and starts at 1.5 mol/L. How long does it take to reach 20% conversion? Find t.

k = 0.04 mol/(L·min)C_A0 = 1.5 mol/LX = 20 %

t = min

5.Hard

A first-order reaction has k = 0.005 min⁻¹ at 20 °C and an activation energy of 80 kJ/mol. The batch reactor is now run at 40 °C for 60 min. Find the conversion X reached.

k₁ = 0.005 min⁻¹T₁ = 20 °CE_a = 80 kJ/molT₂ = 40 °Ct = 60 minR = 8.314 J/(mol·K)

X = %

6.Hard

The rate constant of a reaction is 0.1 min⁻¹ at 30 °C and 0.83 min⁻¹ at 55 °C. Find the activation energy E_a.

k₁ = 0.1 min⁻¹T₁ = 30 °Ck₂ = 0.83 min⁻¹T₂ = 55 °CR = 8.314 J/(mol·K)

E_a = kJ/mol

Answer key

1. C_A = 0.3 mol/L
2. C_A = 0.9098 mol/L
3. t = 8 min
4. t = 7.5 min
5. X = 91.29 %
6. E_a = 70.01 kJ/mol

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