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 first-order reaction A → products has a rate constant of 0.01 min⁻¹. The initial concentration of A is 1.5 mol/L. Find the concentration C_A after 20 min.

k = 0.01 min⁻¹C_A0 = 1.5 mol/Lt = 20 min

C_A = mol/L

2.Easy

A first-order reaction has a half-life of 8 min. What percentage f of the reactant is still left after 24 min?

t_½ = 8 mint = 24 min

f = %

3.Medium

A reaction with rate law −r_A = k·C_A² has k = 0.1 L/(mol·min) and starts at 1.5 mol/L. Find the concentration C_A after 15 min.

k = 0.1 L/(mol·min)C_A0 = 1.5 mol/Lt = 15 min

C_A = mol/L

4.Medium

A reaction with rate law −r_A = k·C_A² has k = 0.1 L/(mol·min) and starts at 0.5 mol/L. Find the concentration C_A after 2 min.

k = 0.1 L/(mol·min)C_A0 = 0.5 mol/Lt = 2 min

C_A = mol/L

5.Hard

A first-order reaction has k = 0.002 min⁻¹ at 25 °C and an activation energy of 75 kJ/mol. The batch reactor is now run at 40 °C for 30 min. Find the conversion X reached.

k₁ = 0.002 min⁻¹T₁ = 25 °CE_a = 75 kJ/molT₂ = 40 °Ct = 30 minR = 8.314 J/(mol·K)

X = %

6.Hard

A first-order reaction has k = 0.02 min⁻¹ at 25 °C and an activation energy of 80 kJ/mol. The batch reactor is now run at 40 °C for 10 min. Find the conversion X reached.

k₁ = 0.02 min⁻¹T₁ = 25 °CE_a = 80 kJ/molT₂ = 40 °Ct = 10 minR = 8.314 J/(mol·K)

X = %

Answer key

1. C_A = 1.228 mol/L
2. f = 12.5 %
3. C_A = 0.4615 mol/L
4. C_A = 0.4545 mol/L
5. X = 22.56 %
6. X = 60.88 %

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