Chemistry & Chemical Reactivity
10th Edition
ISBN: 9781337399074
Author: John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher: Cengage Learning
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Textbook Question
Chapter 20, Problem 56SCQ
What is the likelihood that hydrogen (H2) will become a widely used fuel and that the “hydrogen economy” will become a reality? In particular, what are the advantages and disadvantages of H2 as a fuel? What would be necessary for a significant conversion to a “hydrogen economy”?
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The importance of calculating the %yield
of reactions is to assess how successful a
reaction is if the efficiency level is 100%
True, this determines the accuracy of
the reaction.
False, the %yield is calculated on the
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True, the reaction is more successful
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Use the References to access important values if needed for this question.
Hydrocarbons, compounds containing only carbon and hydrogen, are important in fuels.
The heat of combustion of cyclopentane, C5H10, is 786.6 kcal/mol.
Write a balanced equation for the complete combustion of cyclopentane.
How much energy is released during the complete combustion of 454 grams of cyclopentane ?
kcal
Ethanol, C₂H6O, 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-methylhexane,
C7H16, releases
1.150 × 10³ kcal of energy. How much energy is released during the complete combustion of 450. grams of 2-methylhexane?
kcal
Assuming the same efficiency, would 450. grams of ethanol provide more, less, or the same amount of energy as 450. grams of 2-
methylhexane?
Chapter 20 Solutions
Chemistry & Chemical Reactivity
Ch. 20.7 - Prob. 1.1ACPCh. 20.7 - Prob. 1.2ACPCh. 20.7 - Prob. 1.3ACPCh. 20.7 - Prob. 1.4ACPCh. 20.7 - Prob. 1.5ACPCh. 20.7 - Assume that a sample of hard water contains 50....Ch. 20.7 - One way to remove the calcium carbonate residue in...Ch. 20 - Prob. 1PSCh. 20 - Prob. 2PSCh. 20 - In the discussion on the composition of air,...
Ch. 20 - Prob. 4PSCh. 20 - Prob. 5PSCh. 20 - Prob. 6PSCh. 20 - Prob. 7PSCh. 20 - Prob. 8PSCh. 20 - Prob. 11PSCh. 20 - Although there are a number of...Ch. 20 - Prob. 14PSCh. 20 - Prob. 15PSCh. 20 - Prob. 16PSCh. 20 - Which of the following is a renewable energy...Ch. 20 - Prob. 18PSCh. 20 - Prob. 19PSCh. 20 - Prob. 21PSCh. 20 - The enthalpy of combustion of isooctane (C8H18),...Ch. 20 - Energy consumption in the United States amounts to...Ch. 20 - Prob. 24PSCh. 20 - Prob. 25PSCh. 20 - Prob. 27PSCh. 20 - Prob. 30PSCh. 20 - In methane hydrate the methane molecule is trapped...Ch. 20 - Prob. 32PSCh. 20 - Prob. 33PSCh. 20 - Prob. 34PSCh. 20 - Prob. 35PSCh. 20 - Prob. 36PSCh. 20 - Prob. 37PSCh. 20 - Prob. 38PSCh. 20 - Dinitrogen monoxide, N2O (commonly called nitrous...Ch. 20 - Prob. 40PSCh. 20 - Prob. 41PSCh. 20 - Prob. 42PSCh. 20 - Prob. 43GQCh. 20 - Prob. 44GQCh. 20 - Prob. 45GQCh. 20 - Prob. 46GQCh. 20 - Prob. 47GQCh. 20 - Prob. 48GQCh. 20 - Prob. 49ILCh. 20 - Prob. 50ILCh. 20 - Define the terms renewable and nonrenewable as...Ch. 20 - Prob. 52SCQCh. 20 - Prob. 53SCQCh. 20 - Prob. 54SCQCh. 20 - Prob. 55SCQCh. 20 - What is the likelihood that hydrogen (H2) will...Ch. 20 - Prob. 57SCQCh. 20 - Which sulfur compounds are atmospheric pollutants?...
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- 4.60 Why are fuel additives used?arrow_forwardWrite a chemical equation for each process and classify each as reactant-favored or product-favored. (a) A puddle of water evaporates on a summer day. (b) Silicon dioxide (sand) decomposes to the elements Silicon and oxygen. (c) Paper, which is mainly cellulose (C6H10O5)n, bums at a temperature of 451 F. (d) A pinch of sugar dissolves in water at room temperature.arrow_forwardConsider this organic reaction: Br CH3 OHarrow_forward
- A) Ethanol, C2H6O, 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-methylhexane, C7H16, releases 1.150×103 kcal of energy. How much energy is released during the complete combustion of 495 grams of 2-methylhexane ?------------- kcalAssuming the same efficiency, would 495 grams of ethanol provide more, less, or the same amount of energy as 495 grams of 2-methylhexane? --------- B) Combustion reactions are exothermic. The heat of reaction for the combustion of 2-methylheptane, C8H18, is 1.306×103 kcal/mol. What is the heat of combustion for 2-methylheptane in kcal/gram?--------- kcal/gramHow much heat will be given off if molar quantities of 2-methylheptane react according to the following equation? 2 C8H18+25…arrow_forwardmole 5. The average human requires 120 grams of glucose, C&H12O6 per day. How many grams of CO2 are required to produce this amount of glucose in plants? The photosynthetic reaction is: 6 CO2 + 6 H2O → C,H12O6 + 6O2arrow_forwardWhat would be the product of the two electron oxidation of ethanol? The four-electron oxidation? Write balanced chemical equations for each, assuming that the process takes place in water and H2 gas is a product in each step.arrow_forward
- Write down a balanced chemical equation for the complete combustion of methanol CH3OH(I) to CO2(g) H2O(I)arrow_forward10. Use the following information to answer Question 10. Some individuals are proponents of using propane fueled vehicles. The following two reactions are complete combustion reactions for propane and 2, 2, 4-trimethylpentane (a component of gasoline) 1. 2. Combustion Reactions Answer C₂H₂(g) +5 O₂(g) → 3 CO₂(g) +4 H₂O(g) 2 C₂H₁ (1)+25 O₂(g) →>>> 16 CO₂ (g) +18 H₂O(g) Consider the two reactions shown above. From an environmental perspective, which reaction could be considered more environmentally friendly? Explain your answer.arrow_forwardExplain why fuel additives are used.arrow_forward
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