CHEM 130 Chapter 5: Chapter 5 Review
Document Summary
Deals with the amounts of substances consumed and or produced in a chemical reaction. We count atoms by measuring the mass of the sample. To relate mass and the number of atoms, the average atomic mass is required. The amount of carbon atoms in exactly 12g of carbon-12. The mass of 1 mole of an element=the atomic mass in grams. Mass(g) of 1 mole of a compound or element. Obtained for a compound by finding the sum of the average masses of its constituent atoms. The mass percent of each element in a compound. Mass percent=mass of element in 1 mole of substance/mass of 1 mole of substance *100. The simplest whole-number ratio of the various types of atoms in a compound. Can be obtained from the mass percent of elements in a compound. Always an integer multiple of the empirical formula. All of the atoms present in the reactants must also be present in the products.
