By titration, 27.4 mL of aqueous H2SO4 neutralized 28.4 mL of 0.0396 M LiOH solution.
What was the molarity of the aqueous acid
solution?
Answer in units of M.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.