The rate constant k for a certain reaction is measured at two different temperatures:

temperature k

376.0 °c 4.8 x 108

280.0 °C 2.3 x 10 8

Assuming the rate constant obeys the Arrhenius equation, calculate the activation energy Ea for this reaction.

Round your answer to 2 significant digits.

Ea=5.5 Kcal/mole

Explanation:

Let rate constant are  and  at temperature  and

By using Arrhenius equation at two different two different temperature,

By putting value of R=2 cal/mole.K

By rounding off upto 2 significant figure;

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.

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