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

The reaction A + B → C follows the rate law r = k·C_A·C_B², with k = 0.002 L²/(mol²·s). Find the reaction rate r when C_A = 0.1 mol/L and C_B = 1 mol/L.

r = k·C_A·C_B²k = 0.002 L²/(mol²·s)C_A = 0.1 mol/LC_B = 1 mol/L

r = mol/(L·s)

2.Easy

A first-order reaction A → products has a rate constant of 0.08 min⁻¹. The initial concentration of A is 1 mol/L. Find the concentration C_A after 15 min.

k = 0.08 min⁻¹C_A0 = 1 mol/Lt = 15 min

C_A = mol/L

3.Medium

A first-order reaction in a batch reactor has k = 0.02 min⁻¹. How long does it take to reach 80% conversion? Find t.

k = 0.02 min⁻¹X = 80 %

t = min

4.Medium

A first-order reaction in a batch reactor has k = 0.01 min⁻¹. How long does it take to reach 80% conversion? Find t.

k = 0.01 min⁻¹X = 80 %

t = min

5.Hard

A first-order reaction has a rate constant of 0.001 s⁻¹ at 100 °C and an activation energy of 90 kJ/mol. Find the pre-exponential factor A in the Arrhenius equation.

k = 0.001 s⁻¹T = 100 °CE_a = 90 kJ/molR = 8.314 J/(mol·K)

A = s⁻¹

6.Hard

Two experiments measure the initial rate of A → products. With C_A0 = 0.25 mol/L the rate is 0.012 mol/(L·s); with C_A0 = 0.75 mol/L it is 0.108 mol/(L·s). Find the reaction order n with respect to A.

C_A0,1 = 0.25 mol/Lr₁ = 0.012 mol/(L·s)C_A0,2 = 0.75 mol/Lr₂ = 0.108 mol/(L·s)

n =

Answer key

1. r = 0.0002 mol/(L·s)
2. C_A = 0.3012 mol/L
3. t = 80.47 min
4. t = 160.9 min
5. A = 3.971 × 10⁹ s⁻¹
6. n = 2

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