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 = rms speed,
R = 8.314 J/(mol·K)
T = temperature, K
M = molar mass, kg/mol
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
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Root Mean Square Speed concept. You can view video lessons to learn Root Mean Square Speed. Or if you need more Root Mean Square Speed practice, you can also practice Root Mean Square Speed practice problems.