11. Given the following two thermochemical equations: (1) 2H2(g)+O2(g)2H2O(l)Hran=572kJ (2) H2(g)+O2(g)H2O2(l)Hroa=188kJ What is the enthalpy change for the reaction: (3) 2H2O2(I)2H2O(I)+O2(g) ? (A) 102kJ (B) +102kJ (C) 196kJ (D) 672kJ 12. What is the correct thermodynamic equation of formation of ethanol CH3CH2OH(I) ? (Answer: A) (A) 2C (graphite) +3H2(g)+1/2O2(g)CH3CH2OH(I) (B) 4C (graphite) +6H2(g)+O2(g)2CH3CH2OH(l) (C) CH3CH2OH(l)2C (graphite) +3H2(g)+O(g) (D) 2C (graphite) +3H2(g)+O(g)CH3CH2OH(l) Spring 2022 - CHEM 241 - Practice final exam 2 12. 2.54mol Ar gas held in a 2.0L container at 1.5atm and 298.15K is expanded adiabatically and reversibly to a final volume of 15.0L. Calculate the work w. (A) 6.0kJ (B) +6.0kJ (C) 12.kJ (D) +12.kJ 13. Calculate the entropy change when 2mol of H2O(g) are expanded at constant pressure of 2 atm from 10L to 20 L. Consider an ideal gas. (A) +11.5JK1 (B) 11.5JK1 (C) 5.76JK1 (D) +5.76JK1 14. Which one of the following equations defines the enthalpy of reaction, H, for a reaction occurring at constant pressure that does expansion work? (A) H=U (B) H=U+pV (C) H=q+w (D) H=qv 15. Which one of the following statements describes a path function? (A) A property of a system that depends only on the current state of the system, not on the path the system took to reach that state. (B) A property of a system that depends on the path taken between the initial and final states. (C) The sum of kinetic and potential energy contained in a substance. (D) The heat energy absorbed by a system at constant pressure