NCERT Class XI Chemistry States of Matter Solutions

Question : 9

Total: 23

Density of a gas is found to be 5.46 g/dm3 at 27°C and at 2 bar pressure. What will be its density at STP?

Solution:

We know that PV = nRT
or P =

dRT

∴ d =

or d α

(R and M are constant for a given gas)
or

or d2 =

d1×P2×T1

P1×T2

d1 = 5.46 gdm–3, P1 = 2 bar, T1 = 273 + 27 = 300 K, d2 = ?, P2 = 1 bar, T2 = 273 K
∴ d2 =

5.46gdm−3×1‌bar×300K

2‌bar×273K

= 3.0 gdm−3

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