Chemistry

Question Analysis
This question evaluates the student's ability to use Avogadro's number to determine the number of molecules in a given number of moles.

Key Concept Explanation
Avogadro's number, , represents the number of particles (molecules, atoms, etc.) in one mole of a substance.

Step-by-step Solution
1. Identify the given number of moles: 4.5 moles.
2. Use Avogadro's number: