Heat required to dissociate C2H4 and F 2 is
For
breaking
1 CC
614 KJ / mol
For breaking 4 C----H 2 x 413 KJ / mol
For breaking F-----F 154 KJ / mol
Total = 614 + ( 4 x 413 ) + 154 =2420 KJ / mol
If same atoms combine to give C2H2F2 energy is given out
For making 1 C-------C 347 KJ / mol
For making 4 C-----H 4 x 413 KJ / mol
For making 2 C------F 2 x Z KJ / mol
Here Z is bond dissociation energy of C----Cl bond
Total = 347 + (4 x 413) + (2 x Z) = - (1999+( 2 x Z ) ) KJ/ mol
H
reaction = - (1999 + (2 x Z)) KJ/ mol + 2420 KJ / mol = -549 KJ /
mol
(1999 + (2 x Z)) KJ/ mol = -549 KJ / mol - 2420 KJ / mol
-1999- (2 x Z)) KJ/ mol = -2969 KJ / mol
- (2 x Z)) KJ/ mol = -2677 KJ / mol +1999
= -970 KJ/ mol
Z = (970 KJ/ mol)/2
Z = 485 KJ/mol
Carbon fluorine bond energy = 485 KJ / mol
(g)+ F2 g) Estinate the carbon-fluorine bood energy given that the CC bond energy is 347...
Monday: Kead sections 8.10-8.11: Ch.8 #77: 7. Consider the following reaction: H H C=C (g) + F2(g) - > H Η F F H-C-C-H) AH = -549 kJ HH Estimate the carbon-fluorine bond energy given that the C-C bond energy is 347 kJ/mol, the C=C bond energy is 614 kJ/mol, and the F-F bond energy is 154 kJ/mol. Ch.8 #85: Write Lewis structures that obey the octet rule (duet rule for H) for each of the following molecules. Carbon is...
[25] Question 3 3 (a) The bond dissociation enthalpies for C, and F2 are 614 kJ/mol and 154 kJ/mol respectively Using an argument based on Molecular Orbital Theory, explain why C2 has a much larger bond dissociation energy than F2 Illustrate your answer with suitable MO diagrams (10)
What is the bond energy of F2 in kJ mol", given that AH 12 of the unstable molecule CF3 (g) is -508.5 kJ mol", AH (C.g)=717 kJ mol and B.E(C-F) = 485 kJ mol OA 1445 B. 153 O C. 831 D. 76 O E. 230 Reset Selection
Use the table to answer questions about bond energies. Bond Bond Energy (KJ/mol) C—C 347 C=C 611 C-H 414 C-O 360 C=O 736 O-O 142 O=O 498 H-O 464 (i) Calculate the bond energy for breaking all the bonds in a mole of methane, CH4 Express your answer numerically in kilojoules per mole. Change in Heat Ch4 ?=KJ/mol (ii) Calculate the bond energy for breaking all the bonds in a mole of O2 molecules? Express your answer numerically in kilojoules...
Part IV: Bond Energy and Bond Length The strength of a covalent bond is measured by the bond energy. There are tables of average bond energies in your textbook. It is important to remember that these values represent average bond energies. For example, a table may give a value of 745 kJ/mol for C-O, but the actual value in Co, is 799 kJ/mol. Therefore any calculations using these values will only be approximate, The length of a covalent bond is...
Using the bond enthalpies in
the Average Bond Enthalpies table, determine the approximate
enthalpy (in kJ) for each of the following reactions. (Assume the
average bond enthalpy of the Cl–F bond is 254 kJ/mol.) (a) Cl2(g) +
3 F2(g) → 2 ClF3(g) (b) H2C=CH2(g) + H2(g) → H3CCH3(g) (c) 2
CH3(C=O)H(g) + 5 O2(g) → 4 CO2(g) + 4 H2O(g)
ITITIT Average Bond Enthalpies AH bond (kJ/mol) bond AHond (kJ/mol) bond AH bond (kJ/mol) bond bond AH bond (kJ/mol) С-Н...
1. Calculate the bond energy of the CI-F bond using the following data: Cl2(g) + F2(g) → 2CIF(g) AH = -108 kJ Bond enthalpies (kJ/mol): CI-CI (239); F-F (159) CI-C1 = 239 F.F : 159 1 2. Find the experimental Lattice energy of aluminum oxide using a Born-Haber cycle using the following information: AH® (aluminum oxide) = -1676 kJ/mol IE, (aluminum) = 577.6 kJ/mol IE, (aluminum) =1816.7 kJ/mol IE(aluminum) = 2744.8 kJ/mol AH® (aluminum atom, g) = 329.7 kJ/mol AHⓇEAI...
For the reaction: H2(g)+C2H4(g)-->C2H6(g) Bond & Bond Enthalpy H-H 436.4 kJ/mole C-H 414 kJ/mol C-C 347 kJ/mol C=C 620 kJ/mol Substance & delta Hf H2 0 C2H4 52.3 C2H6 -84.7 (a) estimate the enthalpy of reaction, using the bond enthalpy values from the table in kJ/mol (b) Calculate the enthalpy of reaction, using standard enthalpies of formation
Using the standard enthalpy of formation data, show how the standard enthalpy of formation of HF(g) can be used to determine the bond energy. (Enter unrounded values.) (a) bond energy calculated from standard enthalpy of formation kJ/mol (b) average bond enthalpy from the bond enthalpy table k]/mol Average Bond Enthalpies bondAH bond (kJ/mol) bond AHbond (kJ/mol) bond AH bond (kJ/mol) bond AH bond (kJ/mol) O-H 0-0 467 146 495 185 203 156 364 522 335 544 413 347 614 839...
The electron affinity of fluorine is -328 kJ mol-1. Which of the reactions shown below has a reaction energy of +328 kJ mol-1? A) F+(g) + e- ---> F(g) B) F(g) + e- ---> F-(g) C) F-(g) + e- ---> F2-(g) D) F-(g) ---> F(g)+ e- E) F(g) ---> F+(g)+ e- F) F+(g) ---> F2+(g)+ e-