Question

Order the gases from fastest (1.) to slowest (5.) molecular velocity at 25°C and 1 atm....

Order the gases from fastest (1.) to slowest (5.) molecular velocity at 25°C and 1 atm.

SO3

N2

CO2

O3

SO2

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Answer #1

vrms = sqrt (3*R*T/M)

here : T is temperature in Kelvin

M is molar mass

vrms = sqrt (3*R*T/M)

here : T is temperature in Kelvin

M is molar mass

Since T is same for all, the one with lower molar mass will have higher speed

Lets list out molar mass of all given compounds

Molar mass of SO3 = 80.07

Molar mass of N2 = 28.02

Molar mass of CO2 = 44.01

Molar mass of O3 = 48.0

Molar mass of SO2 = 64.07

Increasing order of molar mass is:

N2

CO2

O3

SO2

SO3

Same is the order of decreasing vrms

From fastest to slowest

N2

CO2

O3

SO2

SO3

SO3 (5)

N2 (1)

CO2 (2)

O3 (3)

SO2 (4)

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