CH6HW2 3rd - View Attempt 3 of 5 Tifle CEHWZ Started 4 10...

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Unformatted text preview: View Attempt 3 of 5 Tifle: CEHWZ Started: October 17, 2010 4: 10 PM Submitted: October 17, 2010 4:57 PM Time spent: 00:47:48 Totalgoore: 10/12 = 83.3333% Total score adjusted by 0.0 Maximum possible score: 12 Give the balanced equation for the reaction: formation of 1 mol nitIogen dioxide from its elements (heat ll: absorbed) a "2(9) + 202(9) + heat :> 2N02(g) N2(g) + 202(9) :> ZNOZ(g-) + heat 1/1 [42(9) + 02(9) => 1402(9) + heat 1/2 N2(g) + 02(9') + heat :> M049) H 01.5.09“? None of these Score: 0]] The standard enthalpy change for the following reaction is 772.8 k]. H2(g) + BrZU} a 2HEr(g) What is the standard enthalpy of fonnatjon of hydrogen bromlde? 772.5 k] 72.3 k] -3s.4 k] a 7145.6 kJ 9 W999“? none of these Score: 1/1 Which of the followmg equahone correcth/ deecribee the reaction illustjahng the standard molar enthalpy of fonnatjon for CSHBOQ (I)? - 3 C(graphme) + B H (g) + 4 o (g) 4 C3HBO4 (I) -C3 (5) +He (9) +04 (9) 9 C3HBO4 (I) A B C. 3 Cfgraphibe) +4 H20 (I) -* C3H304 (I) D E B - 3 chraphme) +4 H2 (9) + 202 (g) * CsHsOq (I) - 3 CH2 (9) + 21'” (350 + 202 (9) * 5314304 (I) Score: 1/] Given the following data, what is the enthalpy of the reaction at 25'C shown below? (AH‘ ' (CH-123 :225 ”“1““1' AH" (CH-[4) : 5226mm“ Cal-12(5) + Hzlg) ” (21-14(5) . 174.4 Idlmol . 7 174.4 kJ/mol . 87.2 kllmol A E C. 279.0 kJ/mol D E . More infomiation is needed to answer this question. Score: 1/] Given the following data, what '5 the enthalpy of the reaction at 25°C shown below? (AHf'lH’r) = 0.0 kJ/Inol; AH“ (OH’) = 7230.0 lemol; AH? (“20) = 7235.3 ldfmol) H+(aq) + omsq) » “20(1) 55.8 kllmol 515.0 kJ/mol Us“? -515.8 kJ/mol D. 230.0 ld/mol @ E. -55.8 idlmol Score: 1 1 The chemistry of nitrogen oxides is complex. Given the following reactions and their standard enthalpy changes, (1) Mo(g) + [402(9) :) N205(g) AH : -39.B Id (2} "0(9) + Noam) + 02(9) => "205(9) AH = 412.5 Id (3) 2N02(g) :> N204(g) AH : 757.2 k) (4) 2ND(g) + 02(9) :> 2N02(g) AH : —114.2 I.) (5) N205(g) => N205(s) AH = 754.1 to calculate the heat of reaction for N203(g) + N205(5) => ZNZD4(g) A. -377.B k] B. 35.D kl C. 435.0 k.) B o. —22.2 k) E. None of these is within 5% of the correct answer. Score: Ill The extraction of iron from iron ore may be represented by the following equation: 21:2203 (s) + 3c (2) a 41:2 (2) + 3C02(g) Given the infomIation below, calculate AH. for the process per mole of F2203. AHf Fe203(s) : -B‘26k]mol'1 AHf c02( J = *394kjmnl’1 . .470 k] A B. -Zl134 k] C. . 1220 k] D. +235 kJ B E. 4470 k] Score: 0/1 Althougr the process also reqries water, a sirlpified equation for mating (with mst shown as Fezoa) is 492(5) + 301(9) z) 2Fe203(5) Mm" : —1.65 x 103 to How much mst forms when 4.93 x 103 Id of heat is released? 477 g 954 g E 1.57 x 106 g 233 g 107 g B WFF‘F‘P Score: II] which of the folow'ng is not a state function? A. "E B. "H a C. q I D. P E. V Score: l/l At 2556 and constant preme, carbon monoxide gas combines with oxygen gas to give carbon doxide gas with the evolution of 10.1 It] per gain of carbon monoxide consulted. Wtrat E the value of AH for the reaction as represented by the equation below. 2:0(9) + 02(9) => 2:02 a * 566 Wind E . 203 ltJ/mol 283 kJ/mol 141 kJ/mol - 141 lrJ/mol Score: 1/] WP??? 11. What mass of CH4 (9) mt be buried to release 334 k] of treat to the mornings? 0114(5) + 202(3) a CONS) + ZHQOU) AH': $90k] A. 0.426 g a B. 6.00 g a 0.375 g 2.66 g E. 55.6 g .0 P Score: 1/1 12. A hydrocamm sample was buried it a bomb calorimeter. The temperatue of the calorimeter and the 1.00 kg of water rose rm... 20.45 cc to 23.65 vc. The heat capacity of the calorimeter, exchcilg the water, is 2.21 kJI°C. Using tbs ilformation, detelmiie the beat released by the calibration. A. 13.3 k] B B. 20.5w a c. 46.0 k] D. 06.6 k] E. none of these Score: 1/] ...
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