Question

Which of the following gases will have the highest RMS velocity at 25 c
a O2
bCO2
C SO2
D CO

Answer 1

So2. has highest RMS velociry

Answer 2

Formula of R.m.s velocity of gas = √(3RT/M)

R is as same for every gas as it is universal gas constant

T is here 25°c = 273+25= 298 K

so velocity of gas ∞ 1/M

Now Molecular mass of the gases are-

O₂= 16*2 = 32

CO₂ = 12+ 32 = 44

SO₂ = 32.065+ 32 = 64.065

CO = 12+ 16 = 28

as M is lowest for CO , R.M.S velocity of CO will be maximum.