One mole of a mixture of N 2 , NO 2 and N 2 O 4 has a mean molar mass of 55.4. On heating to a temperature at which all the N 2 O 4 may be presumed to have dissociated: N 2 O 4 
2NO 2 , the mean molar mass tends to the lower value of 39.6. What is the mole ratio of N 2 : NO 2 : N 2 O 4 in the original mixture?
Text Solution
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Let
Total moles 
… ..(i)
mean molar mass before the reaction:
Once the reaction happens, all the ‘z’ moles of N_2O_4 get converted into ‘2y’ moles of NO_2
mean molar mass after the reaction:
… ..(iii)
Using (ii) and (iii) , we get ‘ z’ = 0.4
Also, we get
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