Question

The vapour density of a gas is 40. Calculate the volume of 20g of this gas at 27°C and 950mm pressure of Hg

Answer 1

Answer:

The vapour density of a gas is 40. Calculate the volume of 20 g of this gas at 27oC and 950 mm pressure. Thus, the volume of 80 g of gas at STP is 22.4 lit. ∴ the volume of 20 g of gas at STP is 22.4×2080 22.4 × 20 80 = 5.6 lit.

Explanation:

Mol wt. of the gas = 2 × V.D = 2 × 40 = 80

Thus, the volume of 80 g of gas at STP is 22.4 lit.

∴ the volume of 20 g of gas at STP is  

22.4 × 20

80

= 5.6 lit.

let the volume of this 5.6 of has at 27oC and 950 mm pressure be V lit

∴  V × 950  ( 273 + 27 )  =  5.6 × 560 73

Hence the volume of the gas at 27oC and 950 mm pressure is 4.9 lit.