Thermodynamic Quantities for Selected Substances at 298.15 K (25 °C) Substance ΔH°f (kJ/mol) ΔG°f (kJ/mol) S (J/K-mol) Oxygen O2 (g) 0 0 205.0 H2O (l) -285.83 -237.13 69.91 Sulfur S (s, rhombic) 0 0 31.88 SO2(g) -269.9 -300.4 248.5 SO3(g) -395.2 -370.4 256.2 The value of ΔG° at 25 °C for the oxidation of solid elemental sulfur to gaseous sulfur trioxide, 2S (s, rhombic) + 3O2 (g) → 2SO3 (g)

nanotechnology is a powerful tool in biomaterials research as it creates numerous possibilities for the engineering of functional molecules. nano-bio refers to projected ability to incorporate biomimicry into various materials at nanoscale.  

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.