CHM 131 Lecture Notes - Lecture 1: Joseph Proust, Carbon-12, Unified Atomic Mass Unit
6 Sep 2015
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Office hours: wednesday 1:30-2:30 pm, friday 12:00-1:00 pm. Lavosier: discovered that for 1 gram of sugar with the appropriate amount of oxygen (2 grams), he would get 3 grams. This tells us that for every reaction, we will have conservation of mass (for non-nuclear reactions). We cannot create mass nor destroy mass in a reaction. If we have a limiting agent, it will stop the reaction once the limiting agent runs out even if other agents are still available. Joseph proust: there is a set ratio (law of definite proportion) Avogadro: this must mean that equal volumes of different gases contain the same number of particles as long as it is the same temperature and pressure. Cannizzaro: atoms are units and stays that way during a reaction (avogadro is correct: volumes are proportional to the number of molecules) and eventually built up the atomic masses. 1 mole = 6. 022*1023 things, 1 mole of carbon = 6. 022*1023 atoms of carbon.
