What is the mass of one mole of oxygen molecules ?

The mass of one mole oxygen molecule is 32gm.

Atomic mass of oxygen = 16 grams

Molar mass of oxygen = (16x2)gm = 32gm

Mass of 1 mole of any molecule is equal to it's molar mass.

Which means, mass of 1 mole of oxygen is = 32gm

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.