2005_1_CH101_Final_Soln

2005_1_CH101_Final_Soln - [1] You are in charge and busy...

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Unformatted text preview: [1] You are in charge and busy preparing a special series of chemical demonstrations to be made for people of all ages at the 5 P & C . In preparation, you need to attend to and carefully test several experimental conditions. ( 1 3 1 x 6 1 = 1 18 1 ) ( & k F ) irst, you are considering the following reaction in a container at equilibrium (25 C). 3 HI (l) + N 2(g) NH 3(g) + NI 3(s) , H = + 20.0 KJ Because you are operating on a large scale and that there will be many spectators, you need to be sure which direction the reaction will shift: (i) to the left, (ii) to the right, or (iii) remain unchanged, under each of the following conditions (a f): a) A catalyst is added. ( ) (iii) b) The volume is decreased (hint: thinK of the container as a piston). 1 ) (iii) c) The temperature is lowered. 1 ) (i) d) The total pressure is increased by adding He (g) . 1 ) (iii) e) Some N 2(g) is added. 1 ) (ii) f) Some HI (l) is removed. 1 ) (iii) [2] Next, you are considering the following gaseous reaction that involves the production of extremely hazardous hydrogen fluoride (HF): ( 1 10 1 ) i. 2 F 2 + 2 C 3 H 4 F 2 C 6 H 6 F 6 + 2 HF K 1 From your General Chemistry knowledge, you know that this reaction is composed of these three equations listed below: ii. 3 HF + C 3 H 4 F 2 C 3 HF 5 + 3H 2 K 2 iii. F 2 + C 3 HF 5 C 3 F 6 + HF K 3 iv. 2 C 3 F 6 + 6 H 2 C 6 H 6 F 6 + 6 HF K 4 Calculate the equilibrium constant K 1 (for reaction i) in terms of K 2 , K 3 , and K 4 . 1& ) K 2 2 K 3 2 K 4 ( ( & 6 ( , ( 4 ( ) [3] Lastly, you are worried about a 3-liter iron (Fe) container of 50.0 g mass that contains NO 2 (g) (density = 2.054 g/L) at standard temperature and pressure (STP). The problem is that the NO 2 is corrosive has started to react with the inside wall of the iron container (!) and the total pressure has now fallen to 0.750 atm. However, at this point equilibrium has been attained. From your General Chemical knowledge you have decided that the reaction that has most likely occurred is the following: ( 1 15 1 ) 8 Fe(s) + 6 NO 2 (g) 4 Fe 2 O 3 (s) + 3 N 2 (g) a) You must first calculate the equilibrium pressures of NO...
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2005_1_CH101_Final_Soln - [1] You are in charge and busy...

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