Answered: Given the following bond energies, what… | bartleby

Chemistry

9th Edition

ISBN:9781133611097

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter8: Bonding: General Concepts

Section: Chapter Questions

Problem 71E: Use bond energies to estimate E for the combustion of one mole of acetylene:...

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Question

Given the following bond energies, what is the enthalpy of the combustion of methane?
Bond
Dissociation Energy
H-C
414 kJ/mol
H-O
460 kJ/mol
0-0
146 kJ/mol
0=0
497 kJ/mol
C=O
803 kJ/mol
О
A. -917 kJ/mol
B. -796 kJ/mol
О
C. 796 kJ/mol
О
D. 917 kJ/mol

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Explain why H is obtained directly from coffee-cup calorimeters, whereas E is obtained directly from bomb calorimeters.
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The heat of neutralization, Hneut, can be defined as the amount of heat released (or absorbed), q, per mole of acid (or base) neutralized. Hneut for nitric acid is -52 kJ/mol HNO3. At 27.3C, 50.00 mL of 0.743M HNO3 is neutralized by 1.00 M Sr(OH)2 in a coffee-cup calorimeter. (a) How many mL of Sr(OH)2 were used in the neutralization? (b) What is the final temperature of the resulting solution? (Use the assumptions in Question 11.)
Would the amount of heat measured for the reaction in Example 5.5 be greater, lesser, or remain the same if we used a calorimeter that was a poorer insulator than a coffee cup calorimeter? Explain your answer.
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