34. The vapour density of a mixture of NO2 and n2o4
is 39 at 25°C. What is the mass of NO2, present
in 100 g of the mixture?
) )
(1) 17.9 g
(2) 8.4 g
(3) 33.2 g
(4) 66.4 g
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11th
Chemistry
Some Basic Concepts of Chemistry
Mole Concept and Molar Masses
The vapour density of a mix...
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Asked on November 22, 2019 by
Chhavi Haridas
The vapour density of a mixture containing NO
2
and N
2
O
4
is 38.3 at 27
o
C. Calculate the moles of NO
2
in 100 g of the mixture.
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ANSWER
Mol mass of mixture =2×38.3=76.6
No. of moles in 100 g of mixture =
76.6
100
Let a g of NO
2
is present in mixture.
MolesofNO
2
+MolesofN
2
O
4
=Molesofmixture
46
a
+
92
100−a
=
76.6
100
"or" a=20.10g
Moles of NO
2
in mixture =
46
20.10
=0.437
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