calculate the atomicity of a gas x(at. no. 35.5) whose v.d. is equal to its relative atomic mass.
Atomicity = molecular weight /atomic weight
molecular weight = 2 x V.D
= 2 X 35.5 ( as vapour density =atomic weight which is given in the question)
atomicity = 2 x 35.5/ 35.5
= 2