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Manipal Entrance Test 2019 Chemistry Paper
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© examsnet.com
Question : 9
Total: 50
In a mixture of 1g
H
2
and 8g
O
2
the mole fraction of hydrogen is
0.667
0.5
0.33
None of the above
Validate
Solution:
Number of moles of hydrogen
(
H
2
)
=
Weight in gram of
H
2
Molecular weight of
H
2
Weight of
H
2
in gram = 1 g
molecular weight of
H
2
= 2
Number of moles of
H
2
=
1
2
=
0.5
moles
Number of moles of
(
O
2
)
=
Weight in gram of
O
2
Molecular weight of
O
2
=
8
32
=
0.25
moles
Mole fraction of
(
H
2
)
=
Number of moles of
H
2
Total number of moles
=
0.5
0.25
+
0.5
=
0.667
© examsnet.com
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