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Mole Concept and Avogadro's Number

The vapour de...

Question

The vapour density of a mixture containing $N O_{2}$ and $N_{2} O_{4}$ is $27.6$ . Mole fraction of $N O_{2}$ in the mixture is :

0.8

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0.6

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0.4

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0.2

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Solution

The correct option is B $0.8$
${V a p o u r D e n s i t y}_{m i x} =$
$X_{N O_{2}} (V . D)_{N O_{2}} + X_{N_{2} O_{4}} (V . D)_{N_{2} O_{4}}$
$27.6 = X \times 23 + (1 - X) \times 46$
$∴ X_{N O_{2}} = 0.8$

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The vapour density of a mixture containing $N O_{2}$ and $N_{2} O_{4}$ is $27.6$ . Mole fraction of $N O_{2}$ in the mixture is:

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