Difference between the terms gram atomic mass, gram molecular mass, and gram formula mass:

• Gram atomic mass represents one mole of atom of an element gram, molecular mass represents one mole of molecules of a compound or an element that exists in molecular state, whereas gram formula mass represents one mole of an ionic compound
• Gram atomic mass contains 6.022 x 10²³ atoms gram molecular mass contains 6.022 x 10²³ molecules whereas gram formula mass contains 6.022 x 10²³ formula units.
• All of these quantities represent mass. Mass of one mole of a substance expressed in grams called molar mass. “Therefore, mole can be defined as atomic mass, molecular mass or formula mass expressed in grams."