Chemistry: A Molecular Approach
3rd Edition
ISBN: 9780321809247
Author: Nivaldo J. Tro
Publisher: Prentice Hall
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Chapter 6, Problem 57E
Interpretation Introduction
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How many signals would you expect to see in the
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'C NMR spectrum for the following compound?
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Consider the "C NMR spectrum below.
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The spectrum belongs to which one of the following constitutional isomers of the compound C,H12? Select the single best answer.
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The structure of compound 1,3,5-trimethylbenzene (mesitylene) is given below.
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Chapter 6 Solutions
Chemistry: A Molecular Approach
Ch. 6 - Prob. 1SAQCh. 6 - Q2. Which sample is most likely to undergo the...Ch. 6 - Prob. 3SAQCh. 6 - Q4. A 12.5-g sample of granite initially at 82.0...Ch. 6 - Q5. A cylinder with a moving piston expands from...Ch. 6 - Q6. When a 3.80-g sample of liquid octane (C8H18)...Ch. 6 - Q7. Hydrogen gas reacts with oxygen to form...Ch. 6 - Prob. 8SAQCh. 6 - Prob. 9SAQCh. 6 - Prob. 10SAQ
Ch. 6 - Prob. 11SAQCh. 6 - Prob. 12SAQCh. 6 - Prob. 13SAQCh. 6 - Prob. 14SAQCh. 6 - Q15. Natural gas burns in air to form carbon...Ch. 6 - 1. What is thermochemistry? Why is it important?
Ch. 6 - 2. What is energy? What is work? List some...Ch. 6 - Prob. 3ECh. 6 - 4. State the law of conservation of energy. How...Ch. 6 - Prob. 5ECh. 6 - 6. State the first law of thermodynamics. What are...Ch. 6 - Prob. 7ECh. 6 - 8. What is a state function? List some examples of...Ch. 6 - 9. What is internal energy? Is internal energy a...Ch. 6 - 10. If energy flows out of a chemical system and...Ch. 6 - 11. If the internal energy of the products of a...Ch. 6 - 12. What is heat? Explain the difference between...Ch. 6 - 13. How is the change in internal energy of a...Ch. 6 - 14. Explain how the sum of heat and work can be a...Ch. 6 - 15. What is heat capacity? Explain the difference...Ch. 6 - 16. Explain how the high specific heat capacity of...Ch. 6 - 17. If two objects, A and B, of different...Ch. 6 - 18. What is pressure–volume work? How is it...Ch. 6 - 19. What is calorimetry? Explain the difference...Ch. 6 - 20. What is the change in enthalpy (ΔH) for a...Ch. 6 - 21. Explain the difference between an exothermic...Ch. 6 - 22. From a molecular viewpoint, where does the...Ch. 6 - 23. From a molecular viewpoint, where does the...Ch. 6 - 24. Is the change in enthalpy for a reaction an...Ch. 6 - Prob. 25ECh. 6 - Prob. 26ECh. 6 - 27. What is a standard state? What is the standard...Ch. 6 - Prob. 28ECh. 6 - How do you calculate Hrxno from tabulated standard...Ch. 6 - Prob. 30ECh. 6 - 31. What are the main environmental problems...Ch. 6 - Prob. 32ECh. 6 - Prob. 33ECh. 6 - Prob. 34ECh. 6 - Prob. 35ECh. 6 - 36. A particular frost-free refrigerator uses...Ch. 6 - 37. Which statement is true of the internal energy...Ch. 6 - Prob. 38ECh. 6 - 39. Identify each energy exchange as primarily...Ch. 6 - 40. Identify each energy exchange as primarily...Ch. 6 - 41. A system releases 622 kJ of heat and does 105...Ch. 6 - 42. A system absorbs 196 kJ of heat and the...Ch. 6 - 43. The gas in a piston (defined as the system)...Ch. 6 - Prob. 44ECh. 6 - Prob. 45ECh. 6 - Prob. 46ECh. 6 - 47. How much heat is required to warm 1.50 L of...Ch. 6 - 48. How much heat is required to warm 1.50 kg of...Ch. 6 - 49. Suppose that 25 g of each substance is...Ch. 6 - 50. An unknown mass of each substance, initially...Ch. 6 - 51. How much work (in J) is required to expand the...Ch. 6 - Prob. 52ECh. 6 - 53. The air within a piston equipped with a...Ch. 6 - 54. A gas is compressed from an initial volume of...Ch. 6 - 55. When 1 mol of a fuel burns at constant...Ch. 6 - 56. The change in internal energy for the...Ch. 6 - 57. Determine whether each process is exothermic...Ch. 6 - 58. Determine whether each process is exothermic...Ch. 6 - 59. Consider the thermochemical equation for the...Ch. 6 - 60. What mass of natural gas (CH4) must burn to...Ch. 6 - Prob. 61ECh. 6 - Prob. 62ECh. 6 - 63. The propane fuel (C3H8) used in gas barbeques...Ch. 6 - Prob. 64ECh. 6 - 65. A silver block, initially at 58.5 °C, is...Ch. 6 - Prob. 66ECh. 6 - 67. A 31.1-g wafer of pure gold, initially at 69.3...Ch. 6 - Prob. 68ECh. 6 - Prob. 69ECh. 6 - 70. A 2.74-g sample of a substance suspected of...Ch. 6 - 71. Exactly 1.5 g of a fuel burns under conditions...Ch. 6 - 72. In order to obtain the largest possible amount...Ch. 6 - 73. When 0.514 g of biphenyl (C12H10) undergoes...Ch. 6 - Prob. 74ECh. 6 - 75. Zinc metal reacts with hydrochloric acid...Ch. 6 - Prob. 76ECh. 6 - Prob. 77ECh. 6 - Prob. 78ECh. 6 - 79. Calculate ΔHrxn for the reaction:
Fe2O3(s) + 3...Ch. 6 - 80. Calculate ΔHrxn for the reaction:
CaO(s) +...Ch. 6 - 81. Calculate ΔHrxn for the reaction:
5 C(s) + 6...Ch. 6 - 82. Calculate ΔHrxn for the reaction:
CH4(g) + 4...Ch. 6 - 83. Write an equation for the formation of each...Ch. 6 - Prob. 84ECh. 6 - 85. Hydrazine (N2H4) is a fuel used by some...Ch. 6 - Prob. 86ECh. 6 - Prob. 87ECh. 6 - Prob. 88ECh. 6 - 89. During photosynthesis, plants use energy from...Ch. 6 - Prob. 90ECh. 6 - 91. Top fuel dragsters and funny cars burn...Ch. 6 - 92. The explosive nitroglycerin (C3H5N3O9)...Ch. 6 - 93. Determine the mass of CO2 produced by burning...Ch. 6 - Prob. 94ECh. 6 - Prob. 95ECh. 6 - Prob. 96ECh. 6 - Prob. 97ECh. 6 - Prob. 98ECh. 6 - 99. Evaporating sweat cools the body because...Ch. 6 - Prob. 100ECh. 6 - 101. Use standard enthalpies of formation to...Ch. 6 - 102. Dry ice is solid carbon dioxide. Instead of...Ch. 6 - 103. A 25.5-g aluminum block is warmed to 65.4 °C...Ch. 6 - Prob. 104ECh. 6 - Prob. 105ECh. 6 - Prob. 106ECh. 6 - 107. Derive a relationship between ΔH and ΔE for a...Ch. 6 - Prob. 108ECh. 6 - Prob. 109ECh. 6 - Prob. 110ECh. 6 - Prob. 111ECh. 6 - 112. When 10.00 g of phosphorus is burned in O2(g)...Ch. 6 - 113. The ?H for the oxidation of sulfur in the gas...Ch. 6 - 114. The of TiI3(s) is –328 kJ/mol and the ΔH°...Ch. 6 - Prob. 115ECh. 6 - Prob. 116ECh. 6 - Prob. 117ECh. 6 - 118. A pure gold ring and a pure silver ring have...Ch. 6 - Prob. 119ECh. 6 - Prob. 120ECh. 6 - Prob. 121ECh. 6 - Prob. 122ECh. 6 - Prob. 123ECh. 6 - Prob. 124ECh. 6 - Prob. 125ECh. 6 - Prob. 126ECh. 6 - Prob. 127ECh. 6 - Prob. 128ECh. 6 - Prob. 129ECh. 6 - Prob. 130ECh. 6 - 131. Which statement is true of the internal...Ch. 6 - Prob. 132ECh. 6 - 133. Which expression describes the heat evolved...Ch. 6 - Prob. 134ECh. 6 - 135. A 1-kg cylinder of aluminum and 1-kg jug of...Ch. 6 - Prob. 136ECh. 6 - 137. When 1 mol of a gas burns at constant...Ch. 6 - Prob. 138ECh. 6 - Prob. 139E
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- 1 How many signals do you expect in the 'H NMR spectrum for this molecule? CI CI Cl Write the answer in the table below. Also, in each of the drawing areas below is a copy of the molecule, with H atoms shown. In each copy, one of the H atoms is highlighted red. Highlight in red all other H atoms that would contribute to the same signal as the H already highlighted red. Note for advanced students: Remember, a multiplet is considered one signal in the 'H NMR spectrum. 1 Number of signals in the 'H NMR spectrum. ☐ For the molecule in the top drawing area, highlight in red any other H atoms that will contribute to the same signal as the H atom already highlighted red. If no other H atoms will contribute, check the box at right. No additional H atoms to highlight in top molecule For the molecule in the bottom drawing area, highlight in red any other H atoms that will contribute to the same signal as the H atom already highlighted red. If no other H atoms will contribute, check the box at…arrow_forwardwrtie the balanced equation and find the E° when the following half- reactions are combined Zn2+(aq) + 2e---> Zn(s) E°= -0.763V Ag+(aq) + e---> Ag (s) E°=+0.799Varrow_forwardConsider this molecule: How many H atoms are in this molecule? How many different signals could be found in its 'H NMR spectrum? Note: A multiplet is considered one signal. ☐arrow_forward
- Study this 'H NMR spectrum, and then answer the questions about it in the table below. Check 1.0- 0.5- 0.0 10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 What unit symbol should be written on the horizontal axis? What is the chemical shift & of the doublet? If there is no doublet, just check the box instead. Give your answer to 2 significant digits. What is the chemical shift of the signal immediately upfield of the doublet? If there is no doublet, or no signal upfield of it, check the box instead. What is the chemical shift & of the least deshielded proton? If you can't tell without more information, check the box instead. 血 8 = ☐ There is no doublet. 8 = ☐ No such signal. 8 = 0 Need more information.arrow_forwardhow many moles of H2O2 are required to react with 11g of N2H4 according to the following reaction? (atomic weights: N=14.01, H=1.008, O= 16.00) 7H2O2 + N2H4 -> 2HNO3 + 8H20arrow_forwardcalculate the number of moles of H2 produced from 0.78 moles of Ga and 1.92 moles HCL? 2Ga+6HCL->2GaCl3+3H2arrow_forward
- an adult human breathes 0.50L of air at 1 atm with each breath. If a 50L air tank at 200 atm is available, how man y breaths will the tank providearrow_forwardWhat are the advantages and/or disadvantages of using the MOHR titration method & AOEC method?arrow_forwardAre there any alternative methods better than the MOHR titration to quantitatively determine salt in a sample?arrow_forward
- hybridization of nitrogen of complex moleculesarrow_forwardUsing reaction free energy to predict equilibrium composition Consider the following equilibrium: 2NO2 (g) = N2O4(g) AGº = -5.4 kJ Now suppose a reaction vessel is filled with 4.53 atm of dinitrogen tetroxide (N2O4) at 279. °C. Answer the following questions about this system: Under these conditions, will the pressure of N2O4 tend to rise or fall? Is it possible to reverse this tendency by adding NO2? In other words, if you said the pressure of N2O4 will tend to rise, can that be changed to a tendency to fall by adding NO2? Similarly, if you said the pressure of N2O4 will tend to fall, can that be changed to a tendency to '2' rise by adding NO2? If you said the tendency can be reversed in the second question, calculate the minimum pressure of NO 2 needed to reverse it. Round your answer to 2 significant digits. 00 rise ☐ x10 fall yes no ☐ atm G Ar 1arrow_forwardWhy do we analyse salt?arrow_forward
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