Chapter 17.4, Problem 7CC

3. Use the information contained in "Lab Exercise 11.B" on page 506 in the textbook to answer the following questions. a. Use the reaction equations and reaction enthalpies shown in the introduction section to calculate the following: CSH12CL)-> 5C(s) - 6H2009) 6420 LL A • a reaction enthalpy for the combustion of pentane • a molar enthalpy of combustion for pentane [ 3488.7 kJ and 3488.7 kJ/mol ] Answer: CsHizW180₂(g)-56₂9³ +64₂0(1) CSH12C1-35CCs) +6 H₂(g) H₂Ocg)-4₂0x6 6H20c9-620(1) @4=90.65 *5cc)+502) -560₂ (9) *6=64₂ (9)+302(g)-(20(g 0 Answer: b. Use the calorimetric data provided to calculate a molar enthalpy of combustion for pentane 56cs)+50₂(g) - 500₂6g 6H₂(g) +30₂9-6H₂0lg Answer: -3488.7hJ I mol [3.35 x10 kJ/mol ] =-mclt = -mcat/n =C1.24 kg (4.197( 37.6-18.4)(0.0297907718mol) -3.35×103 kJ/mol [3.98 % ] -=-3488.7 K c. Calculate the percentage error between the value calculated in question 3.a (theoretical value) and the value calculated in question 3.b (experimental value). 0 4.…

1. Consider the BALANCED gas-phase reaction: Note that the full Lewis dot structures are NOT given, only the bond multiplicities. H C=O + 2 H-H CEO 1,079 436 H-H H-C-O-H C-H 414 C-O 351 O-H 460 H Estimate AH (in kJ) for this reaction using the following bond enthalpy data (all bond enthalpies in the above table are in kJ/mol).

Please fill the missing information for the following reactions (4 pts each) HO. NaBH4, CH;CH20H a OH OH H,CrO4 HI Br2 FeBr3 9.

What is the name of the process shown below and how does it work (be specific about what happens to the molecules involved)? Which class of biomolecules (protein, lipid, carbohydrate, nucleic acid) are involved in this particular reaction example? List at least 2 types of functions this class of macromolecules might be involved in biologically. CH₂OH CH₂OH CH2OH CH₂OH НО ОН он ОН н ОН OH ОН Н + H2O → HO ОН ОН н OH + НО ОН ОН Н ОН

Using the table of average bond energies below, the AH for the reaction is kJ. ethanol → ethene + water нн нн Н—С—с—0—н → Ć=Ċ + H-0-H Bond сСС-СО-НС-Н СО AH (kJ/mol) 611 348 464 413 360 -6168 6168 -306 63 46 217

Given that ∆H° for the reaction is -42 kcal/mol and the bond dissociation enthalpies for the C - H, C - Cl, and O - H bonds are 101, 85, and 105 kcal/mol respectively, calculate the bond dissociation enthalpy of the O - Cl bond.

Given that that AH J: C-H- 412, C-C-340, H-H-436, AH ab kl graphite: 716, what is the enthalpy BD of formation of n-butane. Select one a.-126 kJ b. 2864 kJ c 5164 kJ d -120 kJ

Alkane halogenation is a two-step reaction, as shown in the image. Using the table of bond dissociation energies, calculate the enthalpy of cach step and the enthalpy of the overall reaction. Bond Dissociation Energies (for A-B A• ++B) Bond broken AH(kJ/mol) Bond broken AH(kJ/mol) Bond broken A H (kJ/mol) CH, CH, CH, -H CH, CH, CH, -Br H-H 436 423 H-Br 366 294 Br-Br 193 Step 1 CH;CH,CH2-H + CH,CH,CH2 + HBr AH = kJ/mol Step 2 AH = kJ/mol CH,CH,CH2 + Br2 CH,CH,CH-Br + Br: Overall reaction CH,CH,CH,-H + Br2 CH,CH,CH,-Br + HBr AH = kJ/mol.

5. When 1.00g of NaCl (MM 58.44 g/mol) is dissolved in 50.00g of water, the temperature drops by 0.319°C. This temperature change is only detectable by the most sensitive thermometers. If this process takes place in a very well insulated calorimeter, no calorimeter constant is needed. a. Calculate the enthalpy change per gram of NaCl. b. Calculate the enthalpy change per mole of NaCl.