CHEM 110 Lecture Notes - Lecture 2: Molar Mass, Kinetic Energy, Unified Atomic Mass Unit

38 views2 pages
26 Aug 2016
School
Department
Course
Professor

Document Summary

The molecular weight of a compound expressed in amu is numerically the same as the molar mass of the compound expressed in g/mol. Modern view of atom- an atom is almost entirely empty space. Heat- molecules moving randomly potential energy- stored energy. Mechanical- mass is a place where a force can act. Electrostatic- due to interaction of charged particles. First law of thermodynamics- law of conservation of energy. Energy can be converted from one form to another, but total energy remains constant. All energy lost by a system under observation must be gained by the surroundings. State function- a function whose value does not depend on the pathway used to get to the present state, only depends on the current state(composition, t, p): does not depend on past history. Changes in state functions are path- independent. State functions are written as usspercase letters. Q and w are not state functions, but e = q + w is a state function.