Chapter 5: Thermodynamics Worksheet With Answers - Ap Chemistry 2015-2016 Page 14
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1410.
When
a mmonia
i s
o xidized
t o
n itrogen
d ioxide
a nd
w ater,
t he
q uantity
o f
h eat
r eleased
e quals
3 49
kJ
p er
m ol
o f
a mmonia:
2NH
(g)
+
/
O
(g)
→
2 NO
(g)
+
3 H
O(l)
ΔH°
=
-‐‑ 6 98
k J
7
3
2
2
2
2
Calculate
t he
s tandard
m olar
e nthalpy
o f
f ormation
o f
a mmonia
i f
( H
O(l))
=
-‐‑ 2 86
k J/mol
ΔH°
f
2
( NO
(g))
=
+ 33
k J/mol
ΔH°
f
2
-‐‑ 4 7
k J/mol
11.
When
4 0
g rams
o f
a mmonium
n itrate
i s
d issolved
i n
1 00
g rams
o f
w ater
i n
a
c onstant-‐‑ p ressure
coffee-‐‑ c up
c alorimeter,
t he
t emperature
o f
t he
s olution
d rops
b y
2 2.4°C.
I f
t he
s pecific
h eat
o f
t he
solution
i s
4 .18
J K
g
,
c alculate
t he
e nthalpy
o f
s olution
o f
a mmonium
n itrate.
-‐‑ 1
-‐‑ 1
26.2
k J/mol
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