Here's how to calculate the moles of I₂ in 450 grams:

1. Find the molar mass of I₂:

* The atomic mass of iodine (I) is 126.90 g/mol.

* Since I₂ has two iodine atoms, the molar mass is 2 * 126.90 g/mol = 253.80 g/mol

2. Use the formula:

* moles = mass / molar mass

3. Plug in the values:

* moles = 450 g / 253.80 g/mol

* moles ≈ 1.77 mol

Therefore, there are approximately 1.77 moles of I₂ in 450 grams.