une chem 1011 final week 11 & 12 Questions With Complete Solutions

Which of the following is always true? -Spontaneous changes cause an increase in the entropy of the universe -Heat will flow from a cooler object to a hotter object -Processes that involve an increase in entropy of the system are spontaneous -The change in entropy of the universe is the same as the change in entropy of the surroundings correct answer: Spontaneous changes cause an increase in the entropy of the universe A pure, perfectly crystalline solid at 0 K correct answer: has zero entropy In the Gibbs free energy relationshipΔG = ΔH - TΔSTΔS for a spontaneous exothermic process represents correct answer: the energy lost to the surroundings ΔG is correct answer: The free energy change for a process calculated for any set of conditions A process with a ΔG > 0 will be correct answer: nonspontaneous An exothermic process that involves an increase in entropy correct answer: will always be spontaneous The equilibrium reaction N2O4(g) ⇌ 2 NO2(g) has an equilibrium constant K = 1.7 x 103 at 500 K. For this reaction under these conditions correct answer: ΔG < 0, and more products will be present Use the following standard enthalpy and entropy data to calculate the free energy change for the reaction of methane and chlorine gas to produce chloromethane at 298 K: CH2Cl2 + Cl2 ⟶ CHCl3 + HCl correct answer: -96.8 kJ Using the following data: Br2(g) ΔGf° = 3.14 kJ/molHBr(g) ΔGf° = -53.4 kJ/molCalculate the free energy change for the reaction H2 + Br2 ⟶ 2 HBr correct answer: -110. kJ The reaction of hydrogen gas and oxygen gas to mak