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
t (min)C (mol/L)10 minC = ?

A zero-order reaction A → products has a rate constant of 0.005 mol/(L·min). The initial concentration of A is 1.2 mol/L. Find the concentration CA after 10 min.

k = 0.005 mol/(L·min)CA0 = 1.2 mol/Lt = 10 min
CA = mol/L
2.Easy
t (min)C (mol/L)90 minC = ?

A first-order reaction A → products has a rate constant of 0.01 min⁻¹. The initial concentration of A is 1 mol/L. Find the concentration CA after 90 min.

k = 0.01 min⁻¹CA0 = 1 mol/Lt = 90 min
CA = mol/L
3.Medium
t (min)X (%)t = ?40%

A zero-order reaction has k = 0.005 mol/(L·min) and starts at 1.5 mol/L. How long does it take to reach 40% conversion? Find t.

k = 0.005 mol/(L·min)CA0 = 1.5 mol/LX = 40 %
t = min
4.Medium
t (min)X (%)t = ?80%

A second-order reaction (−rA = k·CA²) in a batch reactor has k = 0.1 L/(mol·min) and starts at 2 mol/L. How long does it take to reach 80% conversion? Find t.

k = 0.1 L/(mol·min)CA0 = 2 mol/LX = 80 %
t = min
5.Hard
1/Tln kT = 50 °Cln 0.02ln A = ?Ea​ = 90 kJ/mol

A first-order reaction has a rate constant of 0.02 s⁻¹ at 50 °C and an activation energy of 90 kJ/mol. Find the pre-exponential factor A in the Arrhenius equation.

k = 0.02 s⁻¹T = 50 °CEa = 90 kJ/molR = 8.314 J/(mol·K)
A = s⁻¹
6.Hard
1/Tln kT = 100 °Cln 0.02ln A = ?Ea​ = 90 kJ/mol

A first-order reaction has a rate constant of 0.02 s⁻¹ at 100 °C and an activation energy of 90 kJ/mol. Find the pre-exponential factor A in the Arrhenius equation.

k = 0.02 s⁻¹T = 100 °CEa = 90 kJ/molR = 8.314 J/(mol·K)
A = s⁻¹

Answer key

  1. 1. CA = 1.15 mol/L
  2. 2. CA = 0.4066 mol/L
  3. 3. t = 120 min
  4. 4. t = 20 min
  5. 5. A = 7.069 × 10¹² s⁻¹
  6. 6. A = 7.942 × 10¹⁰ s⁻¹

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