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- [(2.26 x 106) = 44.343] + 130.14 VG ΑΣΦΑΦ Submit hel CO micr HTC ΚΑΛΗΣΠΕΡ Εγκατ ACTI Birtugus Answer ?(CH3CH2MgCl conc Ha, ZnC 2 CH3CH2CI 12, NaOH i) CHCO CH3CH3 CH3CH2COOH CH2=CH2 PC¢,CH2CI2 NH3, Heat CH3CH2OH KMo 4.H* Нeat |CH3CH,NH2 CH3CH2COCH,CH3 Pela Cu" complex, он CH3CN CH3C=0 CH3COOH CH3CO0 + Ag NạCN,H* H20 CH,C=N - N NO2 NaHSO 3 CH4 CH3Br NO2 C=O H,0* CH3MgBr K2Cr,07, H heatThe 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.
- Q1. (a) In each of the following cases (I. to III.) identify which polymer in each pair has the greatest Tg and then explain your selection in terms of molecular structures. Assume that molecular weight differences are insignificant. Note: PMV = pendant molar volume/ cm³/mol Pair I Section A Answer ALL questions in this Section Pair II Pair III Polymer 1 H₂ +²2² 0+. Repeat unit A ht Polymer 3 (PMV=92.3) 3 Polymer 5 (PMV-60.1) tyt OC-CH₂ Polymer 2 | to-0²-0-0 H₂ + -ot Polymer 4 (143.9) (b) Consider the following repeat units A and B, state which polymer is likely to be amorphous and which is likely to be semi-crystalline then explain why in terms of the structure of the repeating units. to *** Polymer 6 (PMV=70.3) Repeat unit B tCan you help me 7b?[1,3] Sigmatropic migrations of hydrogen cannot occur under thermal conditions, but [1,3] sigmatropic migrations of carbon can occur under thermal conditions. Explain!
- Define the following terms :(i) Desorption(ii) Critical micelle concentration(iii) Shape selective catalysis11) Using the data: C₂H4(8), AH°f=+51.9 kJ mol-1, S = 219.8 J mol-1 K-1 CO₂(g), AH°f = -394 kJ mol-¹, So=213.6 J mol-1 K-1 H₂O(1), AH°f = -286.0 kJ mol-¹, S = 69.96 J mol-¹ K-1 O₂(g), AH°f = 0.00 kJ mol-¹, So = 205 J mol-1 K-1 Calculate the maximum amount of work that can be obtained, at 25.0 °C, from the process: C₂H4(g) + 3 O₂(g) → 2 CO₂(g) + 2 H₂O(l) A) 1492 kJ mol-1 B) 1380 kJ mol-1 C) 1451 kJ mol-1 D) 2422 kJ mol-1 E) 1332 kJ mol-1 252253010 armitoron (simodo estoitumoleriam nosalmatinon (dShow that CV,vib goes to nR as T ∞.
- (Q3) (c) What are the limitations of Langmuir adsorption isotherm?D.D. Nelson et al. (Science 238, 1670 (1987)) examined several weakly bound gas-phase complexes of ammonia in search of examples in which the H atoms in NH3 formed hydrogen bonds, but found none. For example, they found that the complex of NH3 and CO2 has the carbon atom nearest the nitrogen (299 pm away): the CO2 molecule is at right angles to the C–N ‘bond’, and the H atoms of NH3 are pointing away from the CO2. The magnitude of the permanent dipole moment of this complex is reported as 1.77 D. If the N and C atoms are the centres of the negative and positive charge distributions, respectively, what is the magnitude of those partial charges (as multiples of e)?Ca(QCI)2 + 2 CH3COOH E-> 2HOCI + (CH3COO)2Ca|