Final answer:
To calculate the rate constant (k) at 75°C, we need the frequency factor (A) for the reaction, which is not provided in the question.
Step-by-step explanation:
The rate constant (k) of a reaction can be calculated using the Arrhenius equation:
k = Ae-Ea/RT
where A is the frequency factor, Ea is the activation energy, R is the gas constant, and T is the temperature in Kelvin.
To calculate k at 75°C, we need to find the frequency factor (A) for the reaction. Unfortunately, the question does not provide the value of A, so we cannot calculate the rate constant at 75°C.