Algonquin College Health Program Assessment (AC-HPAT) Practice Exam

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What is the mass in grams of one mole of oxygen gas?

  1. 16 g

  2. 32 g

  3. 4 g

  4. 10 g

The correct answer is: 32 g

The mass of one mole of oxygen gas is 32 grams. This is because oxygen gas (O₂) is diatomic, meaning each molecule of oxygen gas consists of two oxygen atoms. The atomic mass of a single oxygen atom is approximately 16 grams per mole. Therefore, for O₂, you would calculate the molar mass as follows: 1 atom of O (16 g/mol) × 2 atoms = 32 g/mol. Thus, one mole of oxygen gas, which consists of two atoms of oxygen, has a mass of 32 grams. This value is critical in stoichiometry and understanding gas laws in chemistry, reinforcing the importance of recognizing diatomic elements and their molar mass when conducting chemical calculations.

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