Enthalpy Worksheet With Answers Page 6
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1
2
3
4
5
6Answer:
C
H
S
+ 6O
4CO
+ SO
+ 2H
O
∆H = -2523kJ
4
4
(l)
2(g)
2(g)
2(g)
2
(l)
[4(-393.5) + 1(-296.8) + 2(-285.8)] – [1(∆H) + 6(0)] = -2523
-2442.4 - ∆H = -2523
∆ ∆ ∆ ∆ H = 80.6kJ/mol
Ionic Reactions in Solution
o
o
Given that ∆H
[Mg(OH)
] = -924.5kJ/mol, what is the standard enthalpy change, ∆H
,
f
2(s)
for the reaction of aqueous solutions of magnesium chloride and potassium hydroxide?
(Use table 6.3, p 261)
Answer:
MgCl
+ 2KOH
Mg(OH)
+ 2KCl
2(aq)
(aq)
2(s)
(aq)
2+
-
Mg
+ 2OH
Mg(OH)
(aq)
(aq)
2(s)
[1(-924.5kJ)] – [1(-466.9kJ) + 2(-230.0kJ)]
o
∆ ∆ ∆ ∆ H
= 2.4kJ per mole of Mg(OH)
formed
2(s)
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