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)t½​ = ?C0​/2

A first-order reaction has a rate constant of 0.1 min⁻¹. Find its half-life t½.

k = 0.1 min⁻¹
t½ = min
2.Easy
t (min)C (mol/L)t½​ = ?C0​/2

A first-order reaction has a rate constant of 0.02 min⁻¹. Find its half-life t½.

k = 0.02 min⁻¹
t½ = min
3.Medium
t (min)C (mol/L)t½​ = ?C0​/2

A second-order reaction (−rA = k·CA²) has k = 0.8 L/(mol·min) and an initial concentration of 1 mol/L. Find its first half-life t½.

k = 0.8 L/(mol·min)CA0 = 1 mol/L
t½ = min
4.Medium
t (min)C (mol/L)2 minC = ?

A reaction with rate law −rA = k·CA² has k = 0.2 L/(mol·min) and starts at 2 mol/L. Find the concentration CA after 2 min.

k = 0.2 L/(mol·min)CA0 = 2 mol/Lt = 2 min
CA = mol/L
5.Hard
t (min)X (%)15 minX = ?

A first-order reaction has k = 0.02 min⁻¹ at 30 °C and an activation energy of 60 kJ/mol. The batch reactor is now run at 55 °C for 15 min. Find the conversion X reached.

k1 = 0.02 min⁻¹T1 = 30 °CEa = 60 kJ/molT2 = 55 °Ct = 15 minR = 8.314 J/(mol·K)
X = %
6.Hard
t (min)X (%)15 minX = ?

A first-order reaction has k = 0.002 min⁻¹ at 25 °C and an activation energy of 90 kJ/mol. The batch reactor is now run at 35 °C for 15 min. Find the conversion X reached.

k1 = 0.002 min⁻¹T1 = 25 °CEa = 90 kJ/molT2 = 35 °Ct = 15 minR = 8.314 J/(mol·K)
X = %

Answer key

  1. 1. t½ = 6.931 min
  2. 2. t½ = 34.66 min
  3. 3. t½ = 1.25 min
  4. 4. CA = 1.111 mol/L
  5. 5. X = 84.12 %
  6. 6. X = 9.286 %

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