We can be sure that a mole of table sugar and a mole of vitamin C are equal in their a. mass. b. volume. c. number of atoms. d. number of molecules.

The mole is a fundamental unit in chemistry that quantifies the amount of substance. One mole contains approximately 6.022 x 10^23 entities, which can be atoms, molecules, or ions. This concept allows chemists to relate mass and number of particles in a substance, making it essential for stoichiometric calculations.

Molecular composition refers to the types and numbers of atoms that make up a molecule. For example, table sugar (sucrose) has a different molecular formula than vitamin C (ascorbic acid), leading to different properties. Understanding molecular composition is crucial for comparing substances at the molecular level.

Avogadro's Law states that equal volumes of gases, at the same temperature and pressure, contain an equal number of molecules. This principle extends to all substances, indicating that one mole of any substance contains the same number of molecules, regardless of the substance's mass or volume. This is key to understanding why a mole of sugar and a mole of vitamin C are equal in the number of molecules.