1. Hydrogen peroxide (H2O2) is used in concentrated solution in rocket fuels and dilute solution as hair bleach. An aqueous solution of H2O2 is 30.0% by mass and has a density of 1.11 g/mL. Calculate the following quantities for this solution: (a) molality of H2O2, (b) mole fraction of H2O2, and (c) molarity of H2O2. […]
1. Consider the following molecules: H2S, PF3, CS2, IBr, and CBr4. Which molecules in this list are not polar? Justify your reasoning. We need to determine the polarity of the molecules using the geometries predicted by VSEPR Theory. H2S Þ 2 bonding groups, 2 lone pairs on sulfur bent molecular geometry Þ polar molecule PF3 […]
1. Determine the hybridization scheme used by the underlined atom in each of the molecules below. (a) CO2 2 bonding groups, 0 lone pairs on carbon linear electron geometry Þ sp hybrid orbitals (b) CH2O 3 bonding groups, 0 lone pairs on carbon trigonal planar electron geometry Þ sp2 hybrid orbitals (c) SeF4 4 bonding […]
Gallium consists of two isotopes of masses 68.95amu and 70.95amu with abundance of 60.16% and 39.84%, respectively. What is the average atomic mass of gallium? ( Ans: ca. 69.75) Naturally occurring cupper exists in two isotopic forms: 63Cu and 65Cu. The atomic mass of copper is 63.55amu. What is the approximate abundance of 63Cu? (Ans: […]