Question 78 of 133

If density of vapours of a substance of molar mass 18 gm / mole at 1 atm pressure and 500 K is 0.36 kg m–3 , then value of Z for the vapours is : (Take R = 0.082 L atm mole K–1)

(1) 4150

(2) 5041

(3) 1.1

(4) 0.9