Chemistry Worksheets With Answers Page 4
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5Chem 338 Homework #6
An even simpler test in this case would be to calculate the ratios of p
/x
for each
B
B
set of data points and determine if the resulting K
are consistent with each other.
B
In this case all three K
’s calculated in this way yield 6.4 MPa. Note that this is the
B
least accurate way to find a Henry’s law constant.
6.17) Calculate the concentration of carbon dioxide in fat given that the Henry’s law
4
constant is 8.6 x 10
Torr and the partial pressure of carbon dioxide is 55 kPa.
1 Torr
p =
×
=
55
kPa
412 54
.
Torr
0.13332 kPa
p
=
=
=
412 54
.
From Henry’s law, x
0 0048
.
K
4
×
8 6 10
.
6.19) The mole fractions of N
and O
in air at sea level are approximately 0.78 and
2
2
0.21. Calculate the molalities of the solution formed in an open flask of water at
25ºC.
For a total pressure of 760 Torr,
p
= (0.78)(760) = 592.8 Torr
N 2
p
= (0.21)(760) = 159.6 Torr
O 2
From Henry’s law (H.L. constants from the text):
p
592 8
.
−
N
6
=
=
=
×
2
x
9 106 10
.
N
7
2
×
K
6 51 10
.
N
2
p
159 6
.
−
O
6
=
=
=
×
2
x
4 836 10
.
O
7
2
×
K
3 30 10
.
O
2
n
A
=
The definition of molality: m
A
kg
H O
2
n
n
A
A
=
≈
For 1kg of water, x
A
1000
g
1000
g
+
n
A
18.02 g / mol
18.02 g / mol
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