What is the mass in grams of one mole of any pure substance called?

• A. Atomic number
• B. Empirical mass
• C. Molar mass
• D. Avogadro's number

Answer: (C)

Verified step by step guidance

1. Understand the question is asking for the term that describes the mass in grams of one mole of any pure substance.
2. Recall that the atomic number is the number of protons in an atom's nucleus and does not represent mass.
3. Recognize that empirical mass refers to the simplest whole-number ratio of elements in a compound, not the mass of a mole.
4. Know that Avogadro's number is the number of particles (atoms, molecules) in one mole, approximately \$6.022 \times 10^{23}$, but it is not a mass.
5. Identify that the term for the mass in grams of one mole of a pure substance is the molar mass.