Fassler, Joseph

Chem 3A Fall 2020

3. What will be the cost of gasoline for a round trip between Santa Rosa and Sacramento in a car that averages 24.3 miles per gallon? The distance between the cities is 167 km, and the price of gasoline is $0.792 per liter. 1 mile = 1.609 km 1 gallon = 3.78 liters Composition of Compounds 4. Palmitic acid is a fatty acid derived from palm oil. a. Analysis shows that palmitic acid s 74.94% C, 12.58% H and 12.48% O. What is the empirical formula of palmitic acid? b. If the molar mass of palmitic acid is 256.43 g/mol, what is its molecular formula?

Decomposition Analysis 5. A certain liquid known to be composed of only the elements C, O and Cl reacts with water to form only hydrochloric acid and carbon dioxide.

unknown liquid + H2O CO2 + HCl As a curious scientist, you decide to analyze a sample of the liquid to determine its empirical formula. You begin by reacting 5.545 grams completely with an unknown amount of water vapor. The CO2 and HCl produced are captured chemically and weighed. You determine that 2.467 g CO2 and 4.088 g HCl were formed. What is the unknown liquid’s empirical formula?