The vapour density of a mixture containing \( \mathrm{NO}_{2} \) and \( \mathrm{N}_{2} \mathrm{O...

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The vapour density of a mixture containing \( \mathrm{NO}_{2} \) and \( \mathrm{N}_{2} \mathrm{O}_{4} \) is \( 38.3 \) at \( 300 \mathrm{~K} \). The number of moles of \( \mathrm{NO}_{2} \) in \( 100 \mathrm{~g} \) of the mixture is approximately
(A) \( 0.44 \)
(B) \( 4.4 \)
(C) \( 33.4 \)
(D) \( 3.34 \)
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