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 0.01 mol/(L·min). The initial concentration of A is 1.2 mol/L. Find the concentration C_A after 50 min.

k = 0.01 mol/(L·min)C_A0 = 1.2 mol/Lt = 50 min

C_A = mol/L

2.Easy

A first-order reaction A → products has a rate constant of 0.01 min⁻¹. The initial concentration of A is 0.5 mol/L. Find the concentration C_A after 30 min.

k = 0.01 min⁻¹C_A0 = 0.5 mol/Lt = 30 min

C_A = mol/L

3.Medium

In a first-order reaction the concentration of A falls from 2 mol/L to 1 mol/L in 30 min. Find the rate constant k.

C_A0 = 2 mol/LC_A = 1 mol/Lt = 30 min

k = min⁻¹

4.Medium

A first-order reaction in a batch reactor has k = 0.1 min⁻¹. How long does it take to reach 95% conversion? Find t.

k = 0.1 min⁻¹X = 95 %

t = min

5.Hard

The rate constant of a reaction is 0.01 min⁻¹ at 30 °C and 0.0211 min⁻¹ at 45 °C. Find the activation energy E_a.

k₁ = 0.01 min⁻¹T₁ = 30 °Ck₂ = 0.0211 min⁻¹T₂ = 45 °CR = 8.314 J/(mol·K)

E_a = kJ/mol

6.Hard

A first-order reaction has k = 0.01 min⁻¹ at 25 °C and an activation energy of 80 kJ/mol. The batch reactor is now run at 45 °C for 10 min. Find the conversion X reached.

k₁ = 0.01 min⁻¹T₁ = 25 °CE_a = 80 kJ/molT₂ = 45 °Ct = 10 minR = 8.314 J/(mol·K)

X = %

Answer key

1. C_A = 0.7 mol/L
2. C_A = 0.3704 mol/L
3. k = 0.0231 min⁻¹
4. t = 29.96 min
5. E_a = 39.92 kJ/mol
6. X = 53.26 %

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