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Chem 10 – Final Exam  key
Useful information: R = 0.08206 liter atm/ mol K = 8.3145 J/mol K
h = 6.626 x 10
34
J s, N
A
= 6.02 x 10
23
, Mass of an electron = 9.11 x 10
31
kg, mass of a proton =
1.673 x 10
27
kg,
1 atm = 101325 Pa = 760 torr, F=96485 coul/mol, ln(10) RT/F (T=298 K) =
0.591 V
E = h
ν
= hc/
λ
, c=3 x 10
8
m/s, E
n
= (n+1/2)h
ν
,
ν
= (1/2
π
) (k/
μ
)
1/2
,
μ
= m
1
m
2
/(m
1
+m
2
)
E
J
= h
2
/(8
π
2
I) J(J+1), I=
μ
R
2
, E
n
= n
2
h
2
/8mL
2
1.
A certain chemical requires 200 kJ/mole to break. What is the longest wavelength photon that
can break this bond?
a. 1025 nm
b. 598 nm
c. 336 nm
d. 1.13 x 104 nm
e. 8.85 x 10
3
nm
2.
The infrared spectrum of
2
H
79
Br has a peak at 1886 cm
1
. (Note that this molecule has a
deuterium – the isotope of hydrogen with atomic mass number of 2.) What is the force constant
of the
2
H –
79
Br bond?
a.
0.137 N/m
b.
28.5 N/m
c.
409 N/m
d. 1.18 x 10
4
N/m
e.
1.26 x 10
27
N/m
3. Consider a radioactive decay in which A
→
B, proceeding with first order kinetics. The
starting mass of A is 4.5 x 10
4
g. The mass of A at t = 15 days is 1.2 x10
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 Spring '10
 G
 Chemistry, Electron, Proton

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