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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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smokebomb13 smokebomb13
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11 years ago
A gas containing both hydrogen molecules and helium atoms has a temperature of 300 K. How does the average speed of the hydrogen molecules compare to the helium atoms?
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#1
11 years ago
Helium is monoatomic. While Hydrogen is diatomic.

Therefore, Since the molecular weight Helium is 2 and a diatomic Hydrogen is 2. I believe the speeds should be exactly the same.

EDIT: Here is the math involved.

velocity (particle) = sqrt(3RT/M) where R= gas constant (8.314 kJ/kg*K), T=temperature, M=molar mass.

velocity (hydrogen)= sqrt(3(8.314)(300)/2) = 61.1 m/s
velocity (helium) = sqrt(3(8.314)(300)/2)= 61.1 m/s
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