Chemistry
4th Edition
ISBN: 9780078021527
Author: Julia Burdge
Publisher: McGraw-Hill Education
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Question
Chapter 5.8, Problem 1PPA
Interpretation Introduction
Interpretation:
The standard enthalpy change of the reaction is to be calculated.
Concept introduction:
The enthalpy of a reactionthattakes place at standard conditions is known as the standard enthalpy of the reaction.
The standard enthalpy of formation of a compound is defined as the amount of heat change involved when 1mole of a particular compound is formed from its constituent elements in their standard states.
The standard enthalpy of formation of an element in its standard or most stable state is zero.
Enthalpy change of a reaction is the difference of “sum of enthalpy change of the products” and “sum of enthalpy change of the reactants.”
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A scientist measures the standard enthalpy change for the following reaction to be -201.7 kJ :
CO(g) + 3 H2(g) CH4(g) + H20(g)
Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CO(g) is
kJ/mol.
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Retry Entire Group
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The change in enthalpy for the reaction A → P is x kJ/mol. What does the enthalpy
change for the reaction P →A ?
(A) -x kJ/mol
(B) +x kJ/mol
(C) 0 kJ/mol
(D) -2x kJ/mol
9. Standard enthalpy of formation of N(g) is 472 kJ/mol. From this information,
estimate the bond enthalpy of N2.
(A) 163 kJ/mol
(B) 236 kJ/mol
(C) 326 kJ/mol
(D) 472 kJ/mol
(E) 944 kJ/mol
Chapter 5 Solutions
Chemistry
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