1. Determine the molar mass of oxygen gas (O₂):
* Oxygen has an atomic mass of approximately 16.00 g/mol.
* Since oxygen gas is diatomic (O₂), its molar mass is 2 * 16.00 g/mol = 32.00 g/mol
2. Use the formula:
* mass = moles * molar mass
3. Plug in the values:
* mass = 2.50 mol * 32.00 g/mol
4. Calculate the mass:
* mass = 80.0 g
Therefore, the mass of 2.50 moles of oxygen gas is 80.0 grams.
