Organic Chemistry - Standalone book
10th Edition
ISBN: 9780073511214
Author: Francis A Carey Dr., Robert M. Giuliano
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 2, Problem 40P
The heats of combustion of methane and butane are
kcal/mol) and
kcal/mol), respectively. When used as a fuel, would methane or butane
generate more heat for the same mass of gas? Which would generate more heat for the
same volume of gas?
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Ethanol, C₂H60, is most often blended with gasoline - usually as a 10 percent mix - to create a fuel called gasohol.
Ethanol is a renewable resource and ethanol-blended fuels, like gasohol, appear to burn more efficiently in combustion
engines. The combustion of one mole of ethanol releases 326.7 kcal of energy.
The combustion of one mole of 2-methylheptane,
C8H18, releases
1.306 × 10³ kcal of energy. How much energy is released during the complete combustion of 405 grams of 2-
methylheptane?
kcal
Assuming the same efficiency, would 405 grams of ethanol provide more, less, or the same amount of energy as 405
grams of 2-methylheptane?
more
less
the same amount
Retry Entire Group 9 more group attempts remaining
The heats of combustion of methane and butane are 890 kJ/mol (212.8 kcal/mol) and 2876 kJ/mol (687.4 kcal/mol), respectively. When used as a fuel, would methane or butane generate more heat for the same mass of gas? Which would generate more heat for the same volume of gas?
How much heat is produced if 8.0 moles of ethane undergo complete combustion?The heat of combustion for ethane, C2H6, is 45.7 kJ/g.
Chapter 2 Solutions
Organic Chemistry - Standalone book
Ch. 2.4 - Prob. 1PCh. 2.7 - Prob. 2PCh. 2.8 - Identify the orbital overlaps of all of the bonds...Ch. 2.9 - The hydrocarbon shown, called vinylacetylene, is...Ch. 2.12 - Prob. 5PCh. 2.12 - Prob. 6PCh. 2.13 - Prob. 7PCh. 2.14 - Refer to Table 2.2 as needed to answer the...Ch. 2.15 - Prob. 9PCh. 2.15 - Prob. 10P
Ch. 2.16 - Prob. 11PCh. 2.17 - Prob. 12PCh. 2.18 - Prob. 13PCh. 2.20 - Prob. 14PCh. 2.21 - Match the boiling points with the appropriate...Ch. 2.22 - Write a balanced chemical equation for the...Ch. 2.22 - Using the data in Table 2.3, estimate the heat of...Ch. 2.22 - Prob. 18PCh. 2.22 - Prob. 19PCh. 2.23 - Prob. 20PCh. 2.23 - Which of the following reactions requires an...Ch. 2 - The general molecular formula for alkanes is...Ch. 2 - Prob. 23PCh. 2 - Prob. 24PCh. 2 - Prob. 25PCh. 2 - What is the hybridization of each carbon in...Ch. 2 - Prob. 27PCh. 2 - Does the overlap of two p orbitals in the fashion...Ch. 2 - Prob. 29PCh. 2 - Aphids secrete an alarm pheromone having the...Ch. 2 - All the parts of this problem refer to the alkane...Ch. 2 - Prob. 32PCh. 2 - Prob. 33PCh. 2 - Prob. 34PCh. 2 - From among the 18 constitutional isomers of C8H18,...Ch. 2 - Give the IUPAC name for each of the following...Ch. 2 - Using the method outlined in Section 2.16, give an...Ch. 2 - Prob. 38PCh. 2 - Write a balanced chemical equation for the...Ch. 2 - The heats of combustion of methane and butane are...Ch. 2 - In each of the following groups of compounds,...Ch. 2 - Given H for the reaction H2(g)+12O2(g)H2O(l)...Ch. 2 - Prob. 43PCh. 2 - Prob. 44PCh. 2 - Prob. 45PCh. 2 - Prob. 46PCh. 2 - Prob. 47PCh. 2 - Compound A undergoes the following reactions:...Ch. 2 - Prob. 49PCh. 2 - Some Biochemical Reactions of Alkanes Alkanes...Ch. 2 - Prob. 51DSPCh. 2 - Some Biochemical Reactions of Alkanes Alkanes...Ch. 2 - Prob. 53DSP
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- Complete and balance the following combustion reactions. Assume that each hydrocarbon is converted completely to carbon dioxide and water. (a) Propane + O2 (b) Octane + O2 (c) Cyclohexane + O2 (d) 2-Methylpentane + O2arrow_forwardWhen 13.0 g of acetylene, C2H2, undergoes complete combustion, 65.5 kJ of heat are released. a) How much energy is released when one mole of acetylene is burned? b) Write a balanced chemical equation for the reaction and include the heat value in the equation.arrow_forward13,452 kJ of heat are produced from the combustion of 4.40 kg of octane. What is the heat of combustion of octane, based on this information? -349 kJ/mol -79.4 kJ/mol -26.8 kJ/mol -3057 kJ/molarrow_forward
- Consider the complete combustion of octane. Calculate the bond energies (in kJ/mol) for the:Combustion of methane CH4(g)+2O2(g)→CO2(g)+2H2O(g)a. bonds brokenb. bonds formedc. overall reactionarrow_forwardWhat are some current applications of alcohol-based fuels? Why are alcohol-based fuels considered “cleaner” alternatives? What does it mean for energy to be “clean”?arrow_forwardDraw an enthalpy diagram for the formation of propanearrow_forward
- Use average bond energies (table in the hint) to compare the combustion energies of ethane, ethylene, and acetylene. Calculate which of these hydrocarbons releases the most energy per gram. AU(per gram ethane) AU(per gram ethylene) AU(per gram acetylene) kJ/g kJ/g kJ/g These estimates indicate that ✓releases slightly more energy per unit mass than others. Remember that average bond energy calculations provide estimates, not exact values.arrow_forwardThe average bond enthalpy for C-His 413 kJ/mol. 413 kJ of energy is required to break a mole of CH into atoms: CH(g)→C(g) + H(g), AH=413 kJ Using this information, and your answer from Part A, calculate the enthalpy change of the reaction from Part B. That is, calculate the energy required to break only the carbon-carbon bonds in benzene. Express your answer to four significant figures and include the appropriate units. > View Available Hint(s) HA AHrxn = Value Units Submit Part D Complete previous part(s) Next > Provide Feedback 9:33 PM B. W Word Google .. Spotify .. 61°F 11/17/2021arrow_forwardAn impure sample of hydrocarbon having a total mass of 50.8g undergoes combustion analysis to generate 72.6g CO2 (g) and 14.8g H2O (g). Assuming that the impurities do not contain carbon or hydrogen what percentage of the initial sample is the pure hydrocarbon?arrow_forward
- q Save and Exitarrow_forwardFats and oils are an essential part of our diets. Much of their molecular structure consists of long hydrocarbon chains. a) What physical property can often be used to distinguish saturated and unsaturated fat? b) Explain why unsaturated fats are less detrimental to human health than saturated fatsarrow_forwardThe combustion of isoctane reaction produces -5099.5 kJ of heat per mole of C8H18 (g) consumed, under standard conditions. The enthalpy of formation (DHf) for CO2(g) and H2O (g) are -393.5 kJ/mol and -241.8 kJ/mol, respectively. Find the standard enthalpy of formation (DHf) of this isomer of C8H18 (g)? (Show work) C8H18 (g) + O2(g) -> 8CO2(g) + 9H2O(g) DHrxn = -5099.5 kJarrow_forward
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