Temperature Dependence I The rate constant for a reaction relates to activation energy and temperature by the Arrhenius equation, which can be considered to have the form of a linear equation:   In this case a plot of ln k vs. 1/T will give a staight line with a slope equal to -Ea/R.   To determine the value of the activation energy, Ea, create the plot, measure the slope using the least squares analysis, and solve for Ea: Ea = -slope × R R = 8.314 J K-1 mol-1

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