Chemistry
3rd Edition
ISBN: 9780073402734
Author: Julia Burdge
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 5.7, Problem 1PPA
Interpretation Introduction
Interpretation:
The enthalpy change of the reaction is to be calculated.
Concept introduction:
Hess’s law states that the change in enthalpy of a reaction remains the same whether the reaction takes place in a single step or in a number of steps.
On adding the thermochemical equations, the value of enthalpy change is also added, which gives the enthalpy change of the net reaction.
On reversing any equation, the sign of enthalpy change value is changed to the opposite sign.
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Practice Exercise 1The coinage metals (Group 1B) copper, silver, and gold havespecific heats of 0.385, 0.233, and 0.129 J/g-K, respectively.Among this group, the specific heat capacity andthe molar heat capacity as the atomic weightincreases. (a) increases, increases (b) increases, decreases(c) decreases, increases (d) decreases, decreases
SKETCHPAD
You are given the following related reactions and the corresponding enthalpy
changes.
1.
2CO (g)
+ O2(8)
→ 2CO₂
ΔΗ =
2(g)
N
2. 2(g) + O2(g) (g)
In the space below:
→ 2NO, AH = 180.6 kJ
Use are to use the above reactions to determine AH for the following reaction.
2CO(g) + 2NO(g) → 2CO
2(g)
- 566.0 kJ
+ N.
2(g)
Reverse the second reaction. Write the new reaction and enthalpy.
A scientist measures the standard enthalpy change for the following reaction to be 543.0 kJ :
2BRF3(g)-
→Br2(g) + 3 F2(g)
Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of Br2(g) is
kJ/mol.
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Chapter 5 Solutions
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