1. Calculating the Formula Mass of a Compound: Calculate the formula mass of calcium carbonate, which has a molecular formula of CaCO3.

Solution: Formula Mass = (Ca) (1 atom) + (C) (1 atom) + (O) (3 atoms) = 40.078 g/mol

1. Balancing Chemical Equations: Balance the following chemical equation: H2 + O2 → H2O.

Solution: H2 + O2 → 2H2O

1. Investigating Oxidation-Reduction Reactions: Investigate the oxidation-reduction reaction between zinc metal and silver nitrate.

Solution: Zn + 2AgNO3 → Zn(NO3)2 + 2Ag

1. Calculating Enthalpy of Formation: Calculate the enthalpy of formation of magnesium oxide from the data provided in the following equations: Mg + O2 → MgO and Mg + ½O2 → MgO.

Solution: ΔHf° = [(-650.6 kJ/mol) + (9.4 kJ/mol)] / 2 = -320.6 kJ/mol

1. Exploring the Electron Configuration of Elements: Explore the electron configuration of chlorine to determine the number of valence electrons.

Solution: The electron configuration of chlorine is 1s2 2s2 2p6 3s2 3p5, meaning that chlorine has 7 valence electrons.