3. During combustion analysis, the unknown white powder in probler 2 was burned in the presence of oxygen gas to produce gaseous carbon dioxide and gaseous water. a) Write a complete, balanced chemical equation for this reaction. (Use the molecular formula of the unknown powder in your equation.) b) Using the balanced equation in part a, calculate how much oxygen gas (in grams) is required to completely combust 18.4 grams of the white powder? [48.3 g) 2. You are asked to determine the empirical and molecular formulas of an unknown white powder. The powder contains only carbon, hydrogen and oxygen. A 33.55 g sample of the powder (molar mass = 268.36 g/mol) was subjected to combustion analysis. When combustion was complete, 99.03 g of CO2 and 22.53 g of H20 were collected. [CHO) a) Determine the empirical formula