Worksheet: Activation Energy Measurements

In this worksheet, we will practice determining reaction activation energies from direct and indirect concentration data, in both solution and the gas phase.

Q1:

Gaseous hydrogen iodide decomposes to produce hydrogen and iodine. The rate constant for this reaction, 𝑘, was measured at several reaction temperatures, as shown in the table.

Temperature (K)555575645700781
𝑘 (L/mol⋅s)3.52×101.22×108.59×101.16×103.95×10

Calculate, to 3 significant figures, the activation energy for this reaction.

Q2:

Gaseous hydrogen iodide decomposes to produce hydrogen and iodine. The rate constant for this reaction, 𝑘, was measured at several reaction temperatures, as shown in the table.

Temperature (K)555575645700
𝑘 (L/mol⋅s)6.23×102.42×101.44×102.01×10

Calculate the activation energy for this reaction.

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