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Question

The vapour density of a mixture containing NO2 and N2O4 is 38.3 at 27^°C. Calculate the mole no of NO2 in 100g mixture.

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Solution

Mavg=2×Vapordensity=76.6

LetthenumberofmolesofNO2bex

ThemoleofN2O4=100x

Mavg=nNO2MNO2+nN2O4×MN2O4

76.6=x×46+(100x)×92100

7660=46x+920092x

46x=1540

x=33.48moles

MolesofNO2in100molesofthemixture=33.4



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