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It appears that you are correct in your thought process.
Determining by how much the activation energy of the reaction is reduced requires you to basically find
$$Δ(\%) = \frac{E_\mathrm{a1} - E_\mathrm{a2}}{E_\mathrm{a1}} × 100\% = \left(1 - \frac{E_\mathrm{a2}}{E_\mathrm{a1}}\right) × 100\%$$
There is a system of three independent equations
$$
\begin{...
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I tried to find the place where you found the two statements, and I could not.
Absence of long-range forces
The first statement makes sense to me:
There are no intermolecular forces except during the collision between molecules.
The OpenStax Chemistry textbook, for example, has this statement:
Gases are composed of molecules that are in continuous ...
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