In a chemical formula, how do you calculate the number of atoms of an element within

CHEM 1112 Dr. Martín Zysmilich Class Notes for February 2-4 Entropy (February 2)  Units of enthalpy: kJ/mol Units of entropy: J/K∙mol  3 Law of Thermodynamics: the entropy of a perfect crystal of any substance at 0 K is equal to 0 o All molecules in the system have a fixed position; only one possible arrangement o Also, all molecules are in the lowest energy state possible: no translational or rotational energy (no kinetic energy) and lowest possible vibrational energy o Increased temperature increases entropy; therefore, entropy has an absolute value because it can be compared to the absolute value of 0 at 0 K  E