Question

Calculate the preexponential factor, A, for a reaction with a rate constant of 8.72 x 10-2 s-1 at a temperature of 350 K with an activation energy of 44.0 kJ/mol.

Answer 1

Calculate the preexponential factor, A, for a reaction with a rate constant of 8.72 x 10-2 s-1 at a temperature of 350 K with an activation energy of 44.0 kJ/mol

• Use the Arrhenius Equation: k=Ae−Ea/RT. k is the rate constant, A is the pre-exponential factor, T is temperature and R is gas constant (8.314 J/molK) ...
• Use the equation: ln(k1k2)=−EaR(1T1−1T2) .
• Use the equation ΔG=ΔH−TΔS. .

What is exponential factor?

The Arrhenius equation, an empirical link between temperature and rate coefficient, uses the pre-exponential factor or A factor as the pre-exponential constant. When determined through experiment, it is typically denoted by A, whereas collision frequency is typically left to Z.

Depending on the order of the reaction, the units of the pre-exponential factor A will differ from those of the rate constant. It has units of the first order reaction, s1. It is known as the frequency factor as a result.

The frequency factor, A, is dependent on both how frequently molecules collide when all concentrations are 1 mol/L and whether or not the molecules are appropriately orientated at the time of contact, according to collision theory.

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