1) WTF is a moodle?
2) Noone uses ammonium perchlorate as a fuel by itself. Everyone mixes in aluminum. Or other fuels.
1) Moodle is the abbreviation for Modular Object-Oriented Dynamic Learning Environment
2) The problem you are asking about is from "Principles of Modern Chemistry 5Ed" by Oxtoby, Gillis, and Nachtrieb. Maybe you can get an answer to that from the authors of the book.