Question

Oxygen never travels alone so the chemical formula of oxygen gas is really O2. How much does 1.0 mole of O2 weigh?

Answer 1

1 mole = 31.998 grams

Procedure

To determine the weight of a molecule you will need to first retrieve the molecular weight of the elements that compose the molecule. In this case, the only element is Oxygen.

By looking at the periodic table oxygen has a molecular weight of 15.999 g/mole

Then you will need to multiply that weight for the number of atoms in the molecules in this case O₂ has 2 oxygen atoms.

Therefore

15.999 (2) =31.998 g/mol