1. How much money do you have?

2. I have money in abundance.
3. I have money in profusion.
[Are the answers acceptable? The prepositional phrases are adveb phrases, aren't they?]

4. How many books do you have?
5. I have books in abundance.
6. I have books in profusion.
[Are the answers acceptable? The prepositional phrases are adveb phrases, aren't they?]

The answers are fine, yes.

Since these answers mean the same thing as "I have much money" or "I have many books," the prepositional phrases "in abundance" and "in profusion" are adjective phrases. They modify "money" and "books," not the verb.