Ap Chemistry Chapter 16 Multiple Choice Quiz Review With Answers - Malea Mullins, University School Of Jackson Page 9
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14(s) CHCl
(l), ΔH° = 9.2 kJ/mol and ΔS° = 43.9 J/mol·K.
27.
For the process CHCl
3
3
What is the melting point of chloroform?
a. 63°C
b. 210°C
c. 5°C
d. 63°C
e. 5°C
At the M.P. ΔG = 0 so T = ΔH/ΔS
T = 9200 J / 43.9 J/mol·K
T = 210 K which is
°C
28.
Given the following data, calculate the normal boiling point for formic acid (HCOOH).
ΔH
° (kJ/mol)
S° (J/mol·K)
f
410.
HCOOH (ℓ)
130.
363
HCOOH (g)
251
a.
2.57 K
b.
1730°C
c.
388°C
d.
82°C
e.
115°C
HCOOH (ℓ)
C
g
ΔH
° = Ʃ (n
· ΔH
Ʃ (n
· ΔH
°)
°)
rxn
p
prod
r
react
ΔH
ℓ
° = [(1 mol HCOOH (g)) (
kJ/mol
mol
C
(
kJ/mol
rxn
ΔH
° = 47 kJ = 47,000 J
rxn
ΔS
° = Ʃ (n
· ΔS
Ʃ (n
· ΔS
°)
°)
rxn
p
prod
r
react
ΔS
ℓ
° = [(1 mol HCOOH (g)) (
J/mol·K
mol
C
(
J/mol·K
rxn
ΔS
° = 121 J/K
rxn
At B.P. ΔG = 0
Therefore, T = ΔH/ΔS
T = 47,000 J / 121 J/K
T = 388 K = 115°C
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