Chemistry In Context
9th Edition
ISBN: 9781259638145
Author: Fahlman, Bradley D., Purvis-roberts, Kathleen, Kirk, John S., Bentley, Anne K., Daubenmire, Patrick L., ELLIS, Jamie P., Mury, Michael T., American Chemical Society
Publisher: Mcgraw-hill Education,
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Chapter 7.9, Problem 7.11YT
Interpretation Introduction
Interpretation:
Using the given bond energy values check whether the hydrogen really a good fuel or not and also check the calculated value of hydrogen matches to the given equation or not.
Concept Introduction:
Energy of Combustion: The energy released in the form of heat when given substance undergoes combustion reaction.
A Fuel is a substance that releases energy when it gets burnt in presence of Oxygen. The phenomenon a substance getting burnt in presence of Oxygen is termed as combustion and it is exothermic process. The larger the amount of heat released per gram of a substance, greater the potential it has to be a fuel.
Exothermic reaction: Exothermic reactions are those in which evolution of heat takes place during any
Endothermic reaction: Endothermic reactions are those in which heat is absorbed during any chemical reaction. In such type of reactions, external energy is needed
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Students have asked these similar questions
Using the bond enthalpy data from the table below, estimate the enthalpy of reaction (kJ/mol) for the following reaction: 2 NH3 → N2 + 3 H2. Report your answer to the ones place and do not include units. Do not forget to include a negative sign (if required) and do not put a space between the sign and number.
Bond
Bond Energy (kJ/mol)
Bond
Bond Energy (kJ/mol)
N-N
160
H-H
436
N=N
418
H-C
415
N≡N
946
H-N
390
N-O
200
H-O
464
N-F
270
H-F
569
N-P
210
H-Si
395
N-Cl
200
H-P
320
N-Br
245
H-S
432
Consider an internal combustion engine like that used in automobiles. The most common fuel used here is gasoline which is a mixture of hydrocarbons, and an octane rating is given for standardization. Therefore, we will approximate gasoline as being composed of the hydrocarbon, octane, C8H18. Another fuel that is common in racing applications is nitromethane, CH3NO2, used in top fuel dragsters. Let’s consider the combustion of each fuel with oxygen in an internal combustion engine. Let the 8-cylinder engine displacement be 500 in3 total. GOAL: Determine and compare the maximum enthalpy of reaction, ∆Ho rxn, for the combustion of both octane and nitromethane in a single cylinder of the engine. This means determine the maximum amount of fuel that can burn in the cylinder filled with 1 atm of air and the amount of heat that reaction would generate. Here are some suggested steps to guide you along. You will have to look up some data in your book or on the internet. 1. Write a balanced…
The bond enthalpies for the bonds in one molecule of propene are given Table 5.
Table 5 Bond enthalpies for bonds present in propene
Bond
Bond enthalpy (kJ mol-)
C-H
413
C-C
347
C=C
612
b Use information in Table 5 to identify the strongest bond in propene. Suggest
a reason why this is the strongest bond.
Chapter 7 Solutions
Chemistry In Context
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