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One mole of a mixture of N 2, NO 2 , & 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 pressumed to have dissiciated:N 2 O 4 = 2NO 2, the mean molar mass tends to the lower value of 39.6.What is the ratio of N 2 : NO 2 : N 2 O 4 in the original mixture ?
Mean molar mass = > n1(28) + n2(46) + n3(92)/(n1 +n2 +n3) = > 55.4..................(1)and from N2O4 = 2NO2 n3 n2 = 2*n3..................(2)and n1 + n2 + n3 = 1.........................(3)solving eqns. (1) (2) and (3) we get,n1 = 0.19n2 = 0.536n3 = 0.274the fratio would be=>1 : 2.82 : 1.44
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