CHE 132 Chapter Notes - Chapter 6: Enthalpy, International System Of Units, Stoichiometry

• School: Stony Brook University
• Department: Chemistry
• Course: CHE 132
• Professor: Elizabeth Boon; Peter Khalifah; Fernando Raineri

Document Summary

Sign of e is from the system"s perspecive: law of conservation of energy - the total energy of the universe is constant. Deltae universe = deltae system + deltae surroundings: si unit of energy = joule (j) = kg * m^2/s^2. 1 calorie = 4. 184 j: state function - a property dependent only on the current state of the system, not on the path it takes to reach that state. Ex: internal energy, enthalpy, pressure, volume, temperature. Only depends on the difference between final and initial states: q and w are not state functions - their values depend on the path the system takes. 6. 2 - enthalpy: changes at constant pressure: pressure - volume work (pv work) - the mechanical work done when the volume of the system changes in the presence of an external pressure (p). W = -pdeltav: enthalpy (h) = e + pv.