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Question

20% of N2O4 molecule are dissociated in a sample of gas at 27 degree C and 760 torr mixture has the density at the equilibrium

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Solution

Given that,

Degree of dissociation (α)=20

Number of moles formed n=2

Substituting above values in Vant Hoff factor expression

0.2=(i121)

i=1.2

We know that,

Normal molar mass of N2O4=92

Normal molar mass of NO2=46

So abnormal molar mass of mass of each would be

N2O4=921.2=76.67

NO2=461.2=38.33

According to ideal gas equation,

dN2O4 AA=PMRT=176.670.0821300= 3.11g/cm3

Similar,

dNO2=1×38.330.0821×300A=1.56 g/cm3

Total density of equilibrium mixture=3.11+1.56=4.67g/cm3


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