ORGANIC CHEMISTRY
5th Edition
ISBN: 9781259977596
Author: SMITH
Publisher: MCG
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Textbook Question
Chapter 6, Problem 6.44P
Consider the following reaction:
a. Use curved arrows to show the movement of electrons.
b. Calculate
c. Draw an energy diagram assuming that
d. What is
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5.
Calculate AH for the following reaction.
C6H6(1) + 02 (g) --
---→ C(s) + H20(1)
State whether the reaction is exothermic or endothermic and why. The molar enthalpies of combustion
of carbon, water and benzene, are -394 kJ/mol, -286 kJ/mol, and -3,267.4 kJ/mol, respectively.
[4A,2T]
I
Using this reversible reaction, answer the following:
N204= 2NO2
(colorless) (reddish-brown)
0° C
25° C
100° C
Ice Water
Room
Temperature
Hot Water
-As the temperature increased, what happened to the [N204]?
-Was the formation of reactants or products favored by the addition of heat?
-Which reaction is exothermic?
-If the change of enthalpy of this reaction when proceeding left to right is 14 kcal, which chemical equation is correct?
N204= 2NO2 + 14 kcal
N204= 2NO2, HR = +14 kcal
N204 + 14 kcal =
2NO2
N204= 2NO2, HR = -14 kcal
7. Estimate the enthalpy of reaction (in kJ/mol) for the combustion of methane. Be sure to
show a lewis structure for each molecule.
CH, (g) + 20, (g)
·CO, (g) + H,O (g)
Bond Bond Enthalpy
(kJ/mol)
C-O
351
C=0
799
CEO
1070
O-O
142
O=0
498
C-H
414
O-H
460
Chapter 6 Solutions
ORGANIC CHEMISTRY
Ch. 6 - Problem 6.1 Classify each transformation as...Ch. 6 - Prob. 6.2PCh. 6 - Problem 6.3 By taking into account...Ch. 6 - Problem 6.4 Use curved arrows to show the movement...Ch. 6 - Problem 6.5 Follow the curved arrows and draw the...Ch. 6 - Prob. 6.6PCh. 6 - Problem 6.7 Use the values in Table 6.2 to...Ch. 6 - Prob. 6.8PCh. 6 - aWhich Keq corresponds to a negative value of G,...Ch. 6 - Given each of the following values, is the...
Ch. 6 - Given each of the following values, is the...Ch. 6 - The equilibrium constant for the conversion of the...Ch. 6 - Prob. 6.13PCh. 6 - For a reaction with H=40kJ/mol, decide which of...Ch. 6 - For a reaction with H=20kJ/mol, decide which of...Ch. 6 - Draw an energy diagram for a reaction in which the...Ch. 6 - Prob. 6.17PCh. 6 - Prob. 6.18PCh. 6 - Problem 6.19 Consider the following energy...Ch. 6 - Draw an energy diagram for a two-step reaction,...Ch. 6 - Which value if any corresponds to a faster...Ch. 6 - Prob. 6.22PCh. 6 - Problem 6.23 For each rate equation, what effect...Ch. 6 - Prob. 6.24PCh. 6 - Identify the catalyst in each equation. a....Ch. 6 - Draw the products of homolysis or heterolysis of...Ch. 6 - Explain why the bond dissociation energy for bond...Ch. 6 - Classify each transformation as substitution,...Ch. 6 - Prob. 6.29PCh. 6 - 6.30 Draw the products of each reaction by...Ch. 6 - 6.31 (a) Add curved arrows for each step to show...Ch. 6 - Prob. 6.32PCh. 6 - Prob. 6.33PCh. 6 - Prob. 6.34PCh. 6 - Calculate H for each reaction. a HO+CH4CH3+H2O b...Ch. 6 - Homolysis of the indicated CH bond in propene...Ch. 6 - Prob. 6.37PCh. 6 - Prob. 6.38PCh. 6 - 6.39. a. Which value corresponds to a negative...Ch. 6 - Prob. 6.40PCh. 6 - For which of the following reaction is S a...Ch. 6 - Prob. 6.42PCh. 6 - Prob. 6.43PCh. 6 - 6.44 Consider the following reaction: .
Use curved...Ch. 6 - Prob. 6.45PCh. 6 - Draw an energy diagram for the Bronsted-Lowry...Ch. 6 - Prob. 6.47PCh. 6 - Indicate which factors affect the rate of a...Ch. 6 - Prob. 6.49PCh. 6 - 6.50 The conversion of acetyl chloride to methyl...Ch. 6 - Prob. 6.51PCh. 6 - Prob. 6.52PCh. 6 - The conversion of (CH3)3Cl to (CH3)2C=CH2 can...Ch. 6 - 6.54 Explain why is more acidic than , even...Ch. 6 - Prob. 6.55PCh. 6 - Prob. 6.56PCh. 6 - Prob. 6.57PCh. 6 - Although Keq of equation 1 in problem 6.57 does...Ch. 6 - Prob. 6.59P
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- Calculate the enthalpy change when 1.0(1 g of methane is burned in excess oxygen according to the reaction CH,(g) 4- 2O2(g) ->CO2(g) + H-CH/) 1H = -891 kJ/molarrow_forwardn Fig. 10.1, what kind of energy does ball A possess initially when at rest at the top of the hill? What kind of energies are involved as ball A moves down the hill? What kind of energy does ball A possess when it reaches the bottom of the hill and stops moving after hitting ball B? Where did the energy gained by ball B, allowing it to move up the hill, come from?arrow_forwardThe reaction that was on the screen when you started and its derivative demonstrate that the reaction enthalpy, ΔH, changes sign when a process is reversed. Consider the reaction H2O(l)→H2O(g), ΔH =44.0kJ What will ΔH be for the reaction if it is reversed?arrow_forward
- 1. Using two or more of the following. N.(g) + 10,(g) → N.O.(s); AH = 83.7 kJ N.(g) + O(g) → 2NO(g): AH 180.4 kJ IN.(g) + O.(g) → NO.(g): AH = 33.2 KJ IN.(g) + H₂(g) → NH,(g); AH = -45.9 kJ determine AH" for the following reaction. NO(g) + NO₂(g) → N₂O(g)arrow_forwardCalculate ΔH° for each reaction. a. HO• + CH4 → •CH3 + H2O b. CH3OH + HBr → CH3Br + H2Oarrow_forwardCalculate AH for the reaction NH3 (g) + CH4 (g) → HCN (g) + 3 H2 (g) , from the following data. N2 (g) + 3 H2 (g) → 2 NH3 (g) ΔΗ- – 91. 8 kJ /mol C (s, graphite) + 2 H2 (g) → CH4 (g) - 74. 9 kJ / mol AH = 2 C (s, graphite) + H2 (g) + N2 (g) → 2 HCN (g) AH = ΔΗ: 270. 3 kJ / molarrow_forward
- Calculate AH for the reaction NH3 (g) + 5 O2 (g) → 4 NO (g) + 6 H2O (g), from the following data. N2 (g) + O2 (g) → 2 NO (g) ΔΗ - 180.5 kJ / mol N2 (g) + 3 H2 (g) → 2 NH3 (g) /mol AH = - 91. 8 kJ 2 H2 (g) + O2 (g) → 2 H20 (g) AH ΔΗ- - 483. 6 kJ / molarrow_forwardFor each of the following reactions, draw the enthalpy diagram showing the relative energy state of reactants and products. i). SO2 (g) → S(s)+ O2 (g) ΔH = +296 kJ ii). 2 C2H2 (g) + 5 O2 (g) → 4 CO2 (g) + 2 H2O(l) ΔH = -2598.8 kJarrow_forwardFf.316.arrow_forward
- At 10°C, Keq for a reaction is 100. At 30°C, Keq = 10. Does enthalpy increase or decrease during the reaction?arrow_forwardCalculate ΔH° for the reaction using the given bond dissociation energies. CH4(g)+2O2(g)⟶CO2(g)+2H2O(g) Bond ΔH° (kJ/mol) O–OO–O 142 H–OH–O 459 C−HC−H 411 C=OC=O 799 O=OO=O 498 C–OC–O 358 What type of reaction is this?arrow_forwardΔH= H products - H reactants a. Explain the equation above. b. Now, deduce the sign of ΔH for an exothermic and endothermic reaction at constant pressure. c. Enthalpy is a state function. Now discuss what does the enthalpy of reaction means.arrow_forward
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