Question A 1.(a) 6C(g) + 14H(g) CH14(g)           H= -7510KJ/mol 7C(g) + 16H(g) C7H16(g)            H= -7510KJ/mol Use the information given above to determine the average (C-C)and (C-H) bond energies Use the value obtained in (i) to calculate H for the following changes.  3C(g) + 8H(g) C3H8(g)

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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Question A

1.(a) 6C(g) + 14H(g) CH14(g)           H= -7510KJ/mol

  1. 7C(g) + 16H(g) C7H16(g)            H= -7510KJ/mol
  2. Use the information given above to determine the average (C-C)and (C-H) bond energies
  3. Use the value obtained in (i) to calculate H for the following changes. 
  4. 3C(g) + 8H(g) C3H8(g)

(b) You are given the following data of enthalpy of atomization of AI (KJ/mol). 

Enthalpy of atomization of AI  = +324

1st I.E of AI  =  +580 

2nd I.E of AI  =  +1800

3rd I.E of AI  =  +2700

Enthalpy of atomization of Cl = +121

Electron affinity of Chlorine = -364

Estimated L.E of AlCl2  = -2602

 L.E of AlCl3  = -5380

 (i) Draw an energy level diagram for the following reaction 

Al(s) + 3/2Cl(g)    AlCl3(s) 

(ii) Calculate the standard enthalpy of formation (Hf) of AlCl3

(iii) Why is AlCl3 formed in the reaction in (i) rather than AlCl2(s)?

Question A
1.
(a)
+ 14H9)
AH= -7510KJ/mol
6C
CH,
(g)
14(g)
7Cg + 16H9) →C,H,6(9)
AH= -7510KJ/mol
(6),
(i)Use the information given above to determine the average (C – C) and (C - H)
bond energies
6).
(ii)Use the value obtained in (i) to calculate AH for the following changes.
3Cg) + 8Hg) → CgH8(9)
(b) You are given the following data of enthalpy of atomization of Al (KJ/mol).
Enthalpy of atomization of AI = +324
1st 1.E of Al = +580
2nd I.E of Al = +1800
3rd 1I.E of Al = +2700
Enthalpy of atomization of CI = +121
Electron affinity of Chlorine = -364
Estimated L.E of AICI, = -2602
L.E of AICI, = -5380
(i) Draw an energy level diagram for the following reaction
+ 3/2Clg
(ii) Calculate the standard enthalpy of formation (AH,º) of AICI,
(iii) Why is AICI, formed in the reaction in (i) rather than AICI?
AICI3(s)
Transcribed Image Text:Question A 1. (a) + 14H9) AH= -7510KJ/mol 6C CH, (g) 14(g) 7Cg + 16H9) →C,H,6(9) AH= -7510KJ/mol (6), (i)Use the information given above to determine the average (C – C) and (C - H) bond energies 6). (ii)Use the value obtained in (i) to calculate AH for the following changes. 3Cg) + 8Hg) → CgH8(9) (b) You are given the following data of enthalpy of atomization of Al (KJ/mol). Enthalpy of atomization of AI = +324 1st 1.E of Al = +580 2nd I.E of Al = +1800 3rd 1I.E of Al = +2700 Enthalpy of atomization of CI = +121 Electron affinity of Chlorine = -364 Estimated L.E of AICI, = -2602 L.E of AICI, = -5380 (i) Draw an energy level diagram for the following reaction + 3/2Clg (ii) Calculate the standard enthalpy of formation (AH,º) of AICI, (iii) Why is AICI, formed in the reaction in (i) rather than AICI? AICI3(s)
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