Question

The. vapour density of a gaseous element is 5 times that of oxygen under similar conditions . If the molecule is triatomic, what will be d atomic mass

Answer 1

Let’s consider d as density, M as molecular mass therefore

For oxygen, d/M = d(oxygen)/32 ---(1) 

(Oxygen is diatomic => molecular mass = 2*atomic mass = 2*16)

 

For tri atomic molecule, d/M = 5d(oxygen)/(3*atomic mass) ---(2)

Equalizing (1) and (2), we get,

  5/(3*atomic mass) = 1/32

therefore,  atomic mass = 5*32/3 = 53.33 amu