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) 555 575 645 700 781
𝑘 (L/mol⋅s) 3 . 5 2 × 1 0   1 . 2 2 × 1 0   8 . 5 9 × 1 0   1 . 1 6 × 1 0   3 . 9 5 × 1 0  

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) 555 575 645 700
𝑘 (L/mol⋅s) 6 . 2 3 × 1 0   2 . 4 2 × 1 0   1 . 4 4 × 1 0   2 . 0 1 × 1 0  

Calculate the activation energy for this reaction.

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