taborane BgHg(s) burns vigorously in 02 to give B2031s) and H20(). Calculate AHxn for the combustion of 5.00 mo (B203(s) = -1,273.5 kJ/mol (BSH9(s)) = 73.2 kJimol (H20(0] = -285.8 kJ/mol Multiple Choice 45,400 kJ -45,400 kJ - 22700 kJ - 8790 kJ - 9,090 kJ
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- Calculate the enthalpy of formation of propane from:a. Combustion data (ΔHc = –2217 kJ mol–1; ΔHf (CO2) = –393.4 kJ mol–1, ΔHf (H2O) =–285.2 kJ mol–1);b. Bond enthalpies (C–C 348 kJ mol–1; C–H 413 kJ mol–1; H–H 436 kJ mol–1; ΔHvap forcarbon = –717 kJ mol–1).Estimate 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/molCalculate the Enthalpy (AH, in kJ/mol) for the following reaction from the heat of rxn formation data given below (Hint: Carefully check the state symbols in this reaction): 4 NO (g) + 6 H20 (I) → 4 NH3 (g) + 5 O2 (g) = ? NH3(g) AH, = - 45.9 kJ/mol NO(g) = + 90.3 kJ/mol H20(1) AH 285.8 kJ/mol = - H20(g) AH = - 241.80 kJ/mol f
- 1: In the sweetening MEROX process for kerosene the mercaptans are converted into (a) Sulpher (b) Disulphide (c) Hydrogen sulphide (d) None of these 2: Which of the following products contain maximum sulphur? (a) Diesel fuel (b) Fuel oil (c) Jet fuel (d) LPG 3: Which of the following petroleum product has a maximum C/H ratio (by weight)? (a) Light diesel oil (b) Fuel oil (c) Naphtha (d) Heating oil 4: Which of the following hydrocarbon are most desirable in gasoline? (a) Paraffins (b) Isoparaffins (c) Naphthenes (d) Aromatic 5: Octane no. of paraffins: (a) Remain constant with change in the number of carbon atoms (b) Increases with increase in the number of carbon atoms (c)Decreases with increase in the number of carbon atoms (d)None of the above 6: Which of the following hydrocarbons has a maximum octane number? (a) Benzene (b) Cyclohexane (c) Hexane (d) Iso-hexane 7: Which of the following petroleum products has a minimum flashpoint? (a)Gasoline (b) Kerosene (c) Fuel oil (d) Heating…Calculate (triangle)G for: C2H4 (g) + H2O (g) -> C2H5OH(g)Draw a structural formula for a hydrocarbon with the given molecular formula that undergoes hydroboration-oxidation to give the indicated product. (a) (b) • All hydrogen atoms are implied. Apply formal charges where appropriate. • Omit lone pairs and radical electrons from your answer. ● CH10 1. (sia) BH 2. H₂O₂, NaOH [TAYY 1. BH3 CH12 2. H₂O₂, NaOH MATEL Н Ⓡ Sn [F ChemDoodle ? OH Sn [F ?
- Draw a structural formula for a hydrocarbon with the given molecular formula that undergoes hydroboration-oxidation to give the indicated product. (a) (b) • All hydrogen atoms are implied. Apply formal charges where appropriate. • Omit lone pairs and radical electrons from your answer. ● C₂H10 C₂H12 1. (sia) BH 2. H₂O₂, NaOH MAVIL / 1. BHs 2. H₂O₂, NaOH Η OO Sn [F ? ChemDoodle OH Sn [F ? Previous NextCalculate AH° for the reaction: CS2(1) + 202(g) CO2(g) + 2S02(9) AH;° CO2 (9) = -393.5 kJ/mol AH;° SO2 (9) = -296.8 kJ/mol AH;° CS2 (1) = 87.9 kJ/molEstimate the standard enthalpy change AH' for the reaction below: C2 H4 (9) + H2 (g) → C2 H6 (g) Data: Bond energies in kJ-mol1: H-H, 432; C-H, 415; C-C, 345; C=C, 615 -280 kJ -180 kJ -128 kJ +974 kJ -228 kJ
- Using the following bond energies, calculate the molar heat of hydrogenation, AHnydrogenation for the conversion of C2H2 to C2H6- CH= CH(g) + 2H,(g) > CH,CH, (g) Bond Bond Strength (kJ/mol) CC 348 C=C 839 CH 411 H-H 432 kJ/molThe compound whose structure is shown here is acetyl acetone. It exists in two forms:the enol form and the keto form The molecule reacts with OH–to form an anion, [CH3COCHCOCH3] (often abbreviatedacac–for acetylacetonate ion). One or the most interesting aspects of this anion is thatone or more of them can react with transition metal cations to give stable, highlycolored compounds (a) Are the keto and enol forms of acetylacetone resonance forms? Explain youranswer.(b) What is the hybridization or each atom (except H) in the enol form? What changesin hybridization occur when it is transformed into the keto form?(c) What are the electron-pair geometry and molecular geometry around each C atomin the keto and enol forms? What changes in geometry occur when the keto formchanges to the enol form?(d) Draw three possible resonance structures for the acac–ion.(e) Is cis-trans isomerism possible in either the enol or the keto form of acetylacetone?(f) Is the enol form of acetylacetone polar?…Given: C₂H4(g) +302(g)+2CO₂(g)+2H₂O(g) AH(C₂H4)= 52.5 kJ/mol AH (H₂O)=-285.8 kJ/mol A Hºrxn=-1411.1 kJ/mol. Find AH₁(CO₂)=. View Available Hint(s) O-1358 kJ/mol O +393.5 kJ/mol O-1303.5 kJ/mol O-393.5 kJ/mol Submit h