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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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irina irina
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11 years ago
The volumes of all 3 flasks are the same.

Flask A: CO at 760 torr and 273K
Flask B: N2 at 250 torr and 273K
Flask C: H2 at 100 torr and 273K

The answer says Flask C. But I don't know why. I thought that increasing the pressure would increase the velocity? Why is it C?
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#1
11 years ago
you have to look at molar mass.
Ideal gasses have the same kinetic energy, but the lighter it is, the faster the average speed.

Here, H2 is the lightest gas so it will have the highest speed.
The other choices, with the increases in pressure, while they do increase velocity, do not come close to a change in speed that molar mass does.
wrote...
#2
11 years ago
Temperature is the average kinetic energy of molecules...so it's the average mass*velocity.  If temperature is constant, increasing velocity means mass must decrease, and vice versa.
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