8 Questions on Principles of Thermodynamics - Quiz 8 | CH 302, Quizzes of Chemistry

Download 8 Questions on Principles of Thermodynamics - Quiz 8 | CH 302 and more Quizzes Chemistry in PDF only on Docsity! Spring 2006 CH302 Worksheet 1b: Examples of Simple Thermodynamics Multiple Choice Problems 1. Which of the following is a correct statement concerning the Second Law of Thermodynamics? 1. The free energy of a system is temperature dependent. 2. Entropy of a system increases in the phase change from a liquid to a gas. 3. Energy cannot be created nor destroyed. 4. The entropy in the universe is conserved. 2. 75 g of a potato chips are burned in a calorimeter that contains 2 liters of water initially at 297K. After the combustion, the temperature rises 12oC. How much heat is evolved per gram of potato chip burned? The heat capacity of the calorimeter is 200 J/oC? The density of water is 1.0 g/ml. The specific heat of water is 4.18 J/goC. 1. 7.1 kJ/g 2. 100.3 kJ/g 3. 102.7 kJ/g 4. 1.37 kJ/g 3. What is the change of enthalpy associated with the combustion of one mole of ethylene? C2H4 + 3O2 2CO2 + 2H2O 1. 0 kJ 2. -1323 kJ 3. +1323 kJ 4. -3230 kJ 5. +3230 kJ 4. For the combustion reaction of acetaldehyde (C2H4O) 2C2H4O + 5O2 4CO2 + 4H2O assume all reactants and products are gases and calculate the ΔH0rxn using the following bond energy values: C-C BE = 611 kJ/mol C-H BE = 413 kJ/mol O=O BE = 498 kJ/mol C=O BE = 799 kJ/mol H-O BE = 463 kJ/mol 1. -1080 kJ/mol 2. +1080 kJ/mol 3. 0 kJ/mol 4. -2303 kJ/mol 5. +2303 kJ/mol