The approximate percentage composition of the atmosphere on four
different planets is given in the table below.
The density of a gas may be defined as the mass of 1 dm3 of the
gas measured at s.t.p. Which
mixture of gases has the greatest density?
Planet
major gases / % by no of molecules
A Jupiter
H2 89.8 , He 10.2
B Neptune H2 80.0 , He
19.0, CH4 1.0
C Saturn
H2 96.3 , He 3.25 , CH4 0.45
D Uranus H2 82.5
, He 15.2 . CH4 2.3