Problem: At 300K, what is the correct ordering (from slowest to fastest) of average molecular speed of the following gases: Ar, HBr, SO2, and CO2?A) HBr < SO2 < CO2 < ArB) Ar < CO2 < SO2 < HBrC) Ar < HBr < SO2 < CO2D) HBr < CO2 < SO2 < ArE) All these gases have the same average speed at the same temperature

FREE Expert Solution

We’re being asked to arrange the gases (from slowest to fastest) of average molecular speed.


When calculating for root mean square speed (μrms), we will use the following equation:


μrms = 3RTM


µrms = rms speed,
R = 8.314 J/(mol·K)
T = temperature, K
M = molar mass, kg/mol


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Problem Details

At 300K, what is the correct ordering (from slowest to fastest) of average molecular speed of the following gases: Ar, HBr, SO2, and CO2?

A) HBr < SO2 < CO2 < Ar

B) Ar < CO2 < SO2 < HBr

C) Ar < HBr < SO2 < CO2

D) HBr < CO2 < SO2 < Ar

E) All these gases have the same average speed at the same temperature

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