Why can Vmax never be fully attained by an enzyme?

How does initial reaction velocity (V0) differ from Vmax in terms of substrate concentration?

Given a rate constant k2 of 0.5 s^-1 and a total enzyme concentration [ET] of 2 mM, calculate Vmax under saturating substrate conditions.

Two enzyme-catalyzed reactions have different total enzyme concentrations. How would you expect their Vmax values to compare?

In an enzyme kinetics plot, what is the effect of increasing enzyme concentration on initial and maximal reaction velocities?

If the rate constant k2 is 0.8 s^-1 and the total enzyme concentration [ET] is 3 mM, what is Vmax under saturating substrate conditions?

What is the effect of increasing enzyme concentration on initial and maximal reaction velocities in enzyme kinetics plots?