Question

If 11g of a gas occupies 5.6dm^3 at S.T.P, calculate the vapour density​

Answer 1

Answer: B

Step-by-step explanation:

At STP,

1 mole of gas has volume 22.4 L

then no of moles in 5.6 L gas will be

22.4

5.6

​

=0.25 moles

If 0.25 moles of gas weighs 60 g

then 1 mole of gas weighs=

60

------

0.25

​

=240g

Molar mass=240g

Molar mass=2×Vapourdensity

240=2×V.D

⇒V.D=120

Hence, the correct option is (B).