Here's how to calculate the number of moles in 32g of oxygen gas:

1. Determine the molar mass of oxygen gas (O2):

* The atomic mass of oxygen (O) is approximately 16 g/mol.

* Oxygen gas exists as a diatomic molecule (O2), so the molar mass is 16 g/mol * 2 = 32 g/mol.

2. Use the formula:

* moles = mass / molar mass

3. Substitute the values:

* moles = 32 g / 32 g/mol

* moles = 1 mol

Therefore, there is 1 mole of oxygen gas in 32g.