Asked by Anna

87. At what temperature would CO2 molecules have an rms speed equal to H2 molecules 25 degrees C?

First I got the rms of H2 to be 1927.3
by taking u= sq root (3*8.31*298)/(.002

Then I tried to find the temp of CO2 by using 1927.3 sq root .044/ sq root (3*8.31) and I got 81.0 K.

Can someone tell me what I did wrong?
Answered by DrBob222
You didn't show your work so we can't tell you where you went wrong. As a starter; however, I obtained closer to 1920 for u<sub>rms</sub> for H2 (and I used 0.002016 for molar mass H2). Then I plugged in 0.04401 and the other numbers and obtained T = about 6505 K. Check me out on that.
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