Velocity distribution curves general inquiry

AI Thread Summary
In the discussion on velocity distribution curves, the relationship between the number of molecules and average velocity is examined, noting that an increase in molecules typically leads to a lower average velocity. The equation for speed, which incorporates molar mass, raises questions about how the composition of air (with varying percentages of N2, O2, and Ar) affects calculations. The inquiry seeks clarity on whether to calculate average speed based solely on molar masses or to consider the relative percentages of each gas. There is confusion regarding the concept of average speed for a mixture of air molecules. The thread highlights the need for a deeper understanding of how molecular composition influences velocity distribution.
mrjoe2
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for a graph that has the velocity as the x-axis and the number of molecules as the y axis, i know that as the number of molecules increases, the average velocity will become lower and lower, but what if the molecules being tested are in relative amounts?


you have the equation speed = sqrt (3RT/Molar mass) depend on the MOLAR MASS of the molecule. so if you had air which is composed of 78.08% N2, 20.95 percent O2 and .93 percent Ar by volume. what does the percentages have to do with Molar mass? would i still just do my answer in terms of their molar masses or do i need to take into account their percentages?
my TA in u of t could not answer this question, i was hoping someone here could. thank you
 
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What are you trying to calculate - average speed of what? Air molecule? No such thing.
 
mrjoe2 said:
... i know that as the number of molecules increases, the average velocity will become lower and lower ...

I don't understand why this would be true.
 
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