solution5_pdf - elizondo(jie268 Homework 5...

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elizondo (jie268) – Homework 5 – fakhreddine – (51550) 1 This print-out should have 13 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 1.0points Given the equilibrium reaction MgSO 4 (s) MgO(s) + SO 3 (g) which of the following statements is true? 1. If the container were opened to the at- mosphere, eventually only MgSO 4 (s) would remain. 2. At equilibrium, the forward and reverse reactions have stopped. 3. Decreasing the volume of the closed con- tainer at constant temperature would result in more MgO(s) being formed. 4. The same equilibrium condition would result if we started with only pure MgSO 4 (s) in a closed container as if we started with only pure MgO(s) in a closed container. 5. If pure MgSO 4 (s) were placed in a closed container filled with N 2 (g) at 1 atm, the total pressure would increase, due to SO 3 (g) being formed. correct Explanation: As the system goes to equilibrium, the to- tal number of moles of gas would increase, resulting in an increase in pressure. 002 1.0points Consider the following system at equilibrium. H 2 (g) + I 2 (g) 2 HI(g) + heat Which response includes all the following that will shift the equilibrium to the left, and no others? I) increasing the temperature II) decreasing the temperature III) increasing the pressure IV) decreasing the pressure V) removing some HI VI) adding some HI VII) removing some I 2 VIII) adding some I 2 1. II, V, and VIII only 2. I, III, V, and VII only 3. II, IV, VII, and VIII only 4. II only 5. I, VI, and VII only correct Explanation: Increasing temperature adds heat and will shift equilibrium to the left. Changing pres- sure will not affect equilibrium because the number of gas molecules is the same on both sides of the equation. Removing a reactant or adding a product will shift equilibrium to the left. 003 1.0points Consider the reaction system N 2 (g) + 3 H 2 (g) 2 NH 3 (g) at equilibrium in a closed container. If a little more H 2 gas were pumped into the equlib- rium system and the reaction was allowed to proceed until a new equilibrium was estab- lished, the new concentration of H 2 would be (higher, lower) and the new concentration of NH 3 would be (higher, lower) than the origi- nal ones. 1. lower; higher 2. lower; lower 3. higher; higher correct 4. higher; lower Explanation: According to LeChatelier’s principle, in- creasing the concentration of a reactant shifts the equilibrium to the right, using up some of
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