Problem: The following graph shows the distribution of molecular velocities for two different molecules (A and B) at the same temperature. Which molecule would have the higher rate of effusion? a) A b) B c) not enough information to determine

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rate of effusion → proportional to molecular velocity

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Problem Details

The following graph shows the distribution of molecular velocities for two different molecules (A and B) at the same temperature. Which molecule would have the higher rate of effusion? 

A line graph with the molecular velocity measured in meters per second on the x axis, and the relative number of molecules on the y axis. Line A increases sharply and peaks at about five hundred, then approaches zero by fifteen hundred. Line B increases at a slower rate, reaching a peak about as half as high as that of A at approximately twelve fifty meters per second. Line B approaches zero at about twenty-five hundred.


a) A 

b) B 

c) not enough information to determine

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