The density of steam at 27 ∘C and 8.3174×104 pascal is 0.8 kg m−3. The compressibility factor would be
The density of vapour of a substance (X) at 1 atm pressure and 500 K is 0.8 kgm3. The vapour effuses through a small hole at a rate of 45 times slower than oxygen under the same condition. What is the compressibility factor (Z) of the vapour?