The real benzene molecule is 152 kJ/ mole more stable than the imaginary 1,3,5-cyclohexatriene. What do we call this 152 kJ/mole? A destabilization energy В steric energy C oxidation energy D hydrogenation energy E resonance energy
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- What is the heat of combustion of ethane, C2H6, in kilojoules per mole of ethane? Properties of C2H6 at 298K ∆Hf °kJ/mol = –84.0 ∆Gf°kJ/mol –32.0 S°J/(mol·K) = 229.2 Δ?∘rxn=___________kJ/mol ethane3,4-Dimethylpent-1-ene has the formula CH2“CH¬CH(CH3)¬CH(CH3)2. When pure (R)-3,4-dimethylpent-1-ene is treated with hydrogen over a platinum catalyst, the product is (S)-2,3-dimethylpentane. How useful is the (R) or (S) designation for predicting the sign of an optical rotation? Can you predict the sign of the rotation of the reactant? Of the product? (Hint from Juliet Capulet: “What’s in a name? That which we call a rose/By any other name would smell as sweet.”What is the value in kJ/mol, of the lowest energy trnasition above? a.) 545 b.) 444 c.) 320 d.) 266
- table of thermodynamic properties: - C2H4(g) Hf = 52.4 Gf = 68.4 S = 219.3 - H2O(l) Hf = -285.8 Gf = -237.1 S = 70.0 - C2H5OH(l) Hf = -277.6 Gf = -174.8 S = 160.74. Write all possible pairs of Enantiomers and Diastereomers from the following molecules.(use numbers(1;1:1;:V) writing pairs) A) 1. 2R,3R-dichloropentane II. 2R,3S-diChloropentane II. 2S,3R-dichloropentane IV.2S,3S-dichloropentane Enantiomers Diastereomers B) I. 3S,4S-dimethyhexane II. 3S,4R-dimethyhexane III. 3R,4S-dimethyhexane IV. 3R,4R-dimethyhexane Enantiomers DiastereomersEstimate the heat released when 1-butene(CH3CH2CHCH2) reacts with bromine to give CH3CH2CHBrCH2Br. Bond enthalpies are CH : 412 kJ/mol; CC : 348 kJ/mol;CC : 612 kJ/mol; CBr : 276 kJ/mol;BrBr : 193 kJ/mol. 1.317 kJ/mol 2.507 kJ/mol 3.95 kJ/mol 4.288 kJ/mol 5.181 kJ/mol
- The potential energy of a CH3 group in ethane as it is rotated around the C-C bond can be written V= 1/2V0(1 +cos φ), where φ is the azimuthal angle as shown and V0 = 11.6 kJ mol-1. (a) What is the change in potential energy between the trans and fully eclipsed conformations? (b) Show that for smal lvariations in angle, the torsional (twisting) motion around the C-C bond can be expected to be that of a harmonic oscillator. (d) Estimate the vibrational frequency of this torsional oscil lation.NH3(g) -45.9 -16.4 192.8 The middle values are Delta G or Free energy. Thanks N2H4(g) 95.4 159.4 238.5 H2(g) 0 0 130.7Draw the structure of the organic product of the reaction between cyclohexene and H2SO4, H2O. Use the wedge/hash bond tools to indicate stereochemistry where it exists. Separate multiple products using the + sign In cases where there is more than one answer, just draw one.
- DHA is a fatty acid derived from fish oil and an abundant fatty acid in vertebrate brains. Hydrogenation of DHA forms docosanoic acid [CH3(CH2)20CO2H], and ozonolysis forms CH3CH2CHO, CH2(CHO)2 (five equivalents), and HCOCH2CH2CO2H. What is the structure of DHA if all double bonds have the Z configuration?Answer true or false to the following statements about energy diagrams and reactions. Q.) Thermodynamics is the study of the energies of structures that are represented by wells on reaction coordinate diagramsOn a cyclohexane ring, an axial carboxyl group has a conformational energy of 5.9 kJ (1.4 kcal)/mol relative to an equatorial carboxyl group. Consider the equilibrium for the alternative chair conformations of trans-1,4-cyclohexanedicarboxylic acid. Draw the less stable chair conformation on the left of the equilibrium arrows and the more stable chair on the right. Calculate DG0 for the equilibrium as written and calculate the ratio of the more stable chair to the less stable chair at 25°C.