Question

Place the following gases in order of increasing average velocity at 300 K: CO, Ne, O2, and N2O. a) CO = Ne = O2 = N2O b) Ne < CO < O2 < N2O c) CO < O2 < N2O < Ne d) O2 < N2O < Ne < CO e) N2O < O2 < CO < Ne

Answer 1

Concepts & Theory

From Maxwell distribution of speeds in the theory of gaseous system. we get three type of velocity out of which Vav ( average velocity) is one of the velocity.

Vav ( average velocity)

where M = Molar mass of gas ( gm mol^-1 )

R = Gas constant

From (1) we conclude

(Inverse Relation)

Solution

According to questions we have to compare at commn temp i.e 300k hence we will focus on molar mass of gas only.

Co, Molar mass = 2.8 gm Mol^-1

Ne, Molar mass = 20 gm Mol^-1

O₂, Molar mass = 32 gm Mol^-1

N₂O, Molar mass = 44 gm Mol^-1

Answer

Vav order in Decreasing Manner

Ne > Co > O₂ > N₂O

Option (e) is correct.