Problem: Which of the following gases has the lowest average speed at 25°C?a. H2Seb. PH3c. C2H6d. F2 

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We’re being asked which gas has the lowest average speed at 25 ˚C.


Recall that the average speed of a gas is given by:



where R = gas constant, T = temperature, and M = molar mass of the gas.


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Problem Details

Which of the following gases has the lowest average speed at 25°C?

a. H2Se

b. PH3

c. C2H6

d. F


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