Here's how to calculate the moles of KNO3 in 6.5 grams:

1. Find the molar mass of KNO3:

* K (Potassium): 39.10 g/mol

* N (Nitrogen): 14.01 g/mol

* O (Oxygen): 16.00 g/mol (and there are three oxygen atoms)

Molar mass of KNO3 = 39.10 + 14.01 + (16.00 * 3) = 101.11 g/mol

2. Use the formula:

Moles = Mass / Molar Mass

3. Plug in the values:

Moles = 6.5 g / 101.11 g/mol

4. Calculate:

Moles ≈ 0.064 mol

Therefore, there are approximately 0.064 moles of KNO3 in 6.5 grams.