a. Suppose you wanted to dissolve 106 g of Na2CO3 in enough H2O to make 6.00 L of solution. (1) What is the molar mass of Na2CO3? (2) What is the molarity of this solution? b. What is the molarity of a solution of 14.0 g NH4Br in enough H2O to make 150 mL of solution? 2

Chemistry 121: Dr. Clar Chapter 6: Electronic Structure of Atoms 1. Ionized Engergy: amount of energy it takes to pull an electron away 2. Daltons Atomic Theory: a. 1 complete attempt to describe all matter in terms of atoms and their properties b. based on the law of conservation of mass and the law of constant composition i. Law of Constant Composition: 1. A pure compound will always have the same proportions of the same element 2. NaCl: contains the same properties of the elements Na + Cl no matter how much NaCl you have 3. Parts: