Which of the following best describes the molar mass of a compound?

• A. The mass of one molecule of the compound, expressed in atomic mass units (amu)
• B. The mass of one mole of the compound, expressed in grams per mole (g/mol)
• C. The number of atoms in one mole of the compound
• D. The volume occupied by one mole of the compound at standard temperature and pressure

Answer: (B)

Verified step by step guidance

1. Understand that molar mass refers to the mass of a specific amount of substance, specifically one mole of that substance.
2. Recall that one mole of any substance contains Avogadro's number of particles (atoms, molecules, or formula units), which is approximately \$6.022 \times 10^{23}$ particles.
3. Recognize that the molar mass is expressed in grams per mole (g/mol), which connects the mass of a sample to the amount of substance in moles.
4. Distinguish molar mass from atomic mass units (amu), which describe the mass of a single atom or molecule, not a mole of them.
5. Note that molar mass is not related to the volume occupied by the substance or the number of atoms directly, but rather the mass of one mole of the compound.