To calculate the mass of 2 moles of oxygen gas, you need to use the molar mass of oxygen. The molar mass of oxygen (O) is 16 grams per mole, as you correctly mentioned.
Since oxygen gas (O₂) consists of two oxygen atoms, the molar mass of oxygen gas is twice the molar mass of a single oxygen atom. Therefore, the molar mass of oxygen gas (O₂) is:
Molar mass of O₂ = 2 × Molar mass of O = 2 × 16 g/mol = 32 g/mol
Now, to calculate the mass of 2 moles of oxygen gas, you can use the formula:
Mass = Number of moles × Molar mass
Substituting the values:
Mass = 2 mol × 32 g/mol = 64 g
Therefore, the mass of 2 moles of oxygen gas is 64 grams.