(Solved): 5. (14pts) Determine the empirical formulas for compounds with the following percent compositions: ...

5. (14pts) Determine the empirical formulas for compounds with the following percent compositions: a. 81.68% carbon and 18.32% hydrogen b. 15.92% aluminum, 27.42% sulfur, and 56.66% oxygen 6. (30pts)Calculate the molarity of each of the following solutions: a. 0.43875 g of cholesterol, C27H46O, in 0.225 L of serum, the average concentration of cholesterol in human serum b. C. 0.55 millimole of NH3 in 0.750 milliliter of solution, the concentration of NH3 in household ammonia 0.198 kg of ethyl alcohol, C?H5OH, in 0.500 L of solution, the concentration of ethyl alcohol in vodka d. 0.058 g of Cl? in 0.200 L of solution, the solubility of Cl? in water at 20 °C