This document discusses several key concepts related to moles, grams, and liters in chemistry: 1) The gram atomic mass is the mass of one mole of an element in grams, and the gram formula mass is the mass of one mole of a compound by adding the gram atomic masses of its elements. 2) Conversions between moles and grams use the gram atomic/formula mass - moles are multiplied by mass to get grams, and grams are divided by mass to get moles. 3) One mole of any gas occupies 22.4 liters at standard temperature and pressure (0°C and 1 atmosphere). Volume can be converted to moles by dividing liters by 22.