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apchemequiws0809key - AP Chemistry Equilibrium Worksheet...

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Unformatted text preview: AP Chemistry Equilibrium Worksheet apchemequiws0809.doc Name: Date: __ Period: __ 1. Carbon monoxide and hydrogen react according to the following equation: coo) + 3H2(g) <-> CH4(g) + I"20(9) When 1.000mol CO and 3.000mol H2 are placed in a 10.00L vessel at 927°C (1200.K) and allowed to come to equilibrium, the mixture is found to contain 0.387mol H20. What is the molar composition of the equilibrium mixture? That is, how many moles of each substance are present? 0 . :3?" m/ 540 MI W 3 ['00 ~0,38’7;;..é13»< (0 mt 14» ’ 3.000w?' (3210.332) =' Myra/7’» [Hz/o]: .035’7M [or/1’} 2 ,03§?M [00] : .06l3l’l [mm] = mew/1 0, 35?;«1 Oil/q 2. a. Write the equilibrium constant expression Kc for catalytic methanation. C0(9) + 3H2(g) H CH4(g) + |"20(9) b. Write the equilibrium constant expression Kc for the reverse of the previous reaction CH4(9) + |420(9) H‘COG) + I316(9) “It c. Write the equilibrium constant expression Kc for the synthesis of ammonia. N2(9) + 3H2(g) 6-) 2NH3(9) . d. Write the equilibrium expression Kc when the equation for the previous reaction is written 1/2 Nz(g) + H2(g) 6-) NH3(g) _ [Built/#3:; A c ' [CD jE/hj J. rem—“1417’ ., 7&0 E” 7” 3. M] C- K n [AM/37 ‘ ~‘/ 2. 3/1. DWI/42] 3 ELL] 3. Hydrogen iodide, HI, decomposes at moderate temperatures according to the equation 2H1(g) <—> |"2(9) + I2(9) The amount of 12 in the reaction mixture can be determined from the intensity of the violet color of 12; the more intense the color, the more I; in the reaction vessel. When 4.00mol HI was placed in a 5.00L vessel at 458°C, the equilibrium mixture was found to contain 0.442mol 12. What is the value of Kc for the decomposition of HI at this temperature? OrW’LMIe OHM?“ H: 7,00%”: I“ glow/2) Z 3.//¢M HI I A [Evan-1;] 7 (#922,340):- Kc’ ’ (H111. [Ll/L); m 4. Phosphorus pentachloride dissociates on heating: PCI5(g) (-) PCI3(g) + 02(9) If Kc equals 3.28x10‘2 at 191°C, what is Kp at this temperature? 5. a. Quicklime (calcium oxide, CaO) is prepared by heating a source of calcium carbonate, CaC03, such as limestone or seashells. CaCO3(s) (-) C305) + C02(g) Write the expression for Kc. b. You can write the equilibrium constant expression for a physical equilibrium, such as vaporization, as well as for a chemical equilibrium. Write the expression for Kc for the vaporization of water. H200) H H20(9) a v [(1 3 Kb : 7,003 b . 6. A 50.0L reaction vessel contains 1.00mol N2, 3.00mol H2, and 0.500mol NH3. Will more ammonia, NH3, be formed or will it dissociate when the mixture goes to equilibrium at 400.°C? The equation is: a N2(9) + 3H2<g) 9 2NH3(9) Kc is 0.500 at 400°C. , 1 . 3 [Wig] : 23, l thD‘l j} _ _ N V E 1 1 Lox» “ ‘ z 23,] : (095%’0) 2 fl fiLZJbND . b0" 3:02)} (on. >K; All-73 E570 SM . ' [dc insane/M 7. A gaseous mixture contains 0.30mol CO, 0.10mol H2, and 0.020mol H20, plus an unknown amount of CH4, in each liter. This mixture is at equilibrium at 1200.K. c30(9) + 3H2(g) H CH4(g) + I"20(9) What is the concentration of CH4 in this mixture? The equilibrium constant Kc equals 3.92. fell, lfo'ow/Im] 3.92 ‘ 3 [3 30432—040400] . [—019 j : ,os'w : 8.. The reaction c30(9) + |"20(9) 9 (302(9) + “2(9) is used to increase the ratio of hydrogen in synthesis gas (mixtures of CO and H2). Suppose you start with 1.00mol each of carbon monoxide and water in a 50.0L vessel. How many moles of each substance are in the equilibrium mixture at 1000.°C? The equilibrium constant Kc at this temperature is 0.58. :0; 5% I (H; :1 [6071,7003 * [FM/m; GEM» o W] 5x ‘j [:3in 0.53 :C/.00/sv.0 TX] /)4L & 5‘8 {7-,0/13 ‘ ((021, 5‘32”! H2. 9. Hydrogen and iodine react according to the equation |"2(9) + 12(9) H ZHJZg) l. Suppose 1.00mol H2 and 2.00mol 12 are placed in a 1.00L vessel. How many moles of V substances are in the gaseous mixture when it comes to equilibrium at 458°C? The equilibrium constant Kc at this temperature is 49.7. kclw :1 [was L/ x=.937M $1934”! Um: : /.i?w./ w .aééM 13%07-3 10. Predict the direction of reaction when H; is removed from a mixture (lowering its concentration) in which the following equilibrium has been established: H2(9) + 12(9) 9 2H1<g> Kbyzdf/1Ij$ U72? 2:] ' ‘ Tr? Uuw {7W #2 fA’fl‘WmM ACMW mounts I'WI‘MIZS} 74/57 "11% W“! Q : 11. Look at each of the following equations and decide whether an increase of pressure obtained by decreasing the volume will increase, decrease, or have no effect on the amounts of products. a. CO(g) + Clz(g) (—) COCI2(g) b- 2H25(g) <-> 2H2(g) + 52(9) C- C(graphlte) + 52(9) 9 (32(9) a‘DrM W1 (We/es {'40 MM ‘3 L,Prw¢5 fpwaaC$ mus ) , c. New 63le Wis a We 12. Carbon monoxide is formed when carbon dioxide reactions with solid carbon (graphite). C02(g) + C(graphite) (—) 2C0(g); AHO = Is a high or low temperature more favorable to the formation of carbon monoxide? sues; +1., W is “aflfzrm/‘o ref/52‘ "fr 9;” {,4 ‘ p6 W6 WW r. «37.»! ‘50:,s’éi’w-e L/pab’éfiwj ‘7 are. / s co/mefluwl) ...
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