Solve Kinetic Energy & Velocity for Smallest Molecules: A

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The discussion focuses on determining which container holds molecules with the smallest average velocity based on their mass and kinetic energy. Kinetic energy is defined by the equation KE = 0.5mv², indicating that larger molecules, which have greater mass, will have lower velocities at the same temperature. The poster suggests that container B contains the largest molecules, thus inferring they move slower. However, they express uncertainty about how to prove this conclusion in their homework. The key takeaway is that larger molecules generally have lower velocities due to their mass when temperature is constant.
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Homework Statement


Four Containers, kept at the same temperature, have different molecules (A,B,C,D) in gaseous form. The size of the molecules indicates their mass (larger the size, greater the mass). Recalling that Kinetic Energy (KE) is given by KE=.5mv2, choose the container with the smallest average velocity molecules
http://img171.imageshack.us/img171/7545/problem3ul3.jpg


Homework Equations





The Attempt at a Solution



I believe it is B, because larger molecules move slower, but I can't seem to find a way to prove it on my homework.
 
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Does it ask you to prove it?
 
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