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Byju's Answer
Standard XII
Chemistry
Dalton's Law of Partial Pressures
A mixture of ...
Question
A mixture of dihydrogen and dioxygen at 1 bar pressure contains 20 percent by the weight of dihydrogen. Calculate the partial pressure of dihydrogen.
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Solution
Mixture of
O
2
&
H
2
P
T
=
1
b
a
r
20
%
by weight of
H
2
Let the amount of mixture be
100
g
⇒
m
H
2
=
20
g
&
m
O
2
=
80
g
n
H
2
=
m
H
2
2
=
20
2
=
10
m
o
l
n
O
2
=
80
32
=
2.5
m
o
l
As, partial pressure is given by
P
H
2
=
X
H
×
P
T
X
H
=
n
H
2
n
H
2
+
n
O
2
=
10
12.5
=
0.8
∴
P
H
2
=
(
0.8
)
(
1
)
=
0.8
b
a
r
∴
Partial pressure of
H
2
=
0.8
b
a
r
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