Vapor question and mole number

[rsyodoom]

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can someone help!~

THe vapor density of a mixture of NO2 and N2O4 is 38 at 300k. the mole number of NO2 in 100 grams of this mixture is...

is there a certain formula im suppose to follow? how do i set it up? PV=nrt?

THe answer is .437 moles

 

[loveoforganic]

(MW NO2)*(x % NO2) + (MW N2O4)*(100-x % N2O4) = 38

solve for x, then stoichiometry from 100 grams

is how I'd approach it