A sample of hydrogen gas (H $$ _2 $$ ) contains $$ 9.6352 \t...

Question Analysis
This question tests the student's ability to convert the number of molecules to moles using Avogadro's number.

Key Concept Explanation
Avogadro's number, , is the number of molecules in one mole of a substance.

Step-by-step Solution
1. Identify the given number of molecules: molecules of H .
2. Use the formula to convert molecules to moles: