To calculate the activation energy Ea for the decomposition of hydrogen peroxide, we need to use the Arrhenius equation:k = A * exp -Ea / R * T where:k = rate constant 0.005 s A = pre-exponential factor also called the frequency factor Ea = activation energy which we want to find R = gas constant 8.314 J/ mol*K T = temperature in Kelvin 25C + 273.15 = 298.15 K However, we don't have the value of the pre-exponential factor A for this reaction. In order to find the activation energy, we would need either the value of A or another rate constant at a different temperature to compare.If you can provide either of these additional pieces of information, we can proceed to calculate the activation energy.