Question 9
Density of a gas is found to be 5.46 g/dm3 at 27 °C at 2 bar pressure. What will be its density at STP?
For an ideal gas
Density ρ = p x M/ RT
F rom the given data,
5.46 = 2 x M/ 300 x R ………(1)
ALSO ρSTP = 1 x M/ 273 x R ………..(2)
FROM (1) & (2) ,WE GET
ρSTP = (1 x M/ 273 x R) x (300 x R/ 2 x M)
= 300 / 273 X 2 = 3.00 g/dm3
Hence, the density of the gas at STP will be 3 g dm–3.
