Chem. 151 – Chapter 3
1. Understand what the average atomic mass for an element represents and how to use the periodic table to find this information. Be aware of how isotopes are involved in calculating an average atomic mass.
2. Be able to calculate formula weights for any substance. (Recognize that the term molecular weight cannot be applied to ionic compounds.)
3. Know that a mole contains 6.022 ´ 1023 particles. Be able to calculate the molar mass for any substance.
4. Be able to perform unit conversions between grams, moles, and number of particles for any chemical formula (atoms, ionic compounds, molecules).
5. Be able to calculate mass percents from chemical formulas.
6. Be able to calculate empirical formulas from percent composition data.
7. Be able to calculate molecular formulas from percent composition data and molecular weight data.
8. Be familiar with the system used to represent chemical reactions through a balanced chemical equation, including abbreviations used for states of matter. Be able to balance any chemical equation using coefficients.
9. Recognize that coefficients provide mole ratios between all reactants and products in a chemical equation. Be able to use these ratios in mole-mole and mass-mass stoichiometry problems.
10. Understand what a limiting reactant is. Be able to perform calculations to determine the identity of the limiting reactant and the theoretical yield for a chemical reaction if given mass data for the reactants. Be able to calculate percent yield if given an actual yield.