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Posted by on Friday, January 13, 2012 at 10:44pm.

Which molecule has the greatest average velocity at 100 degrees celsius.

He, Cl2, Xe, O2, NO2

I used the root mean squared formula but I think I did it wrong. I got Xe as my answer. Is this correct?

  • Chemistry - , Friday, January 13, 2012 at 11:00pm

    From u = sqrt(3RT/M), the largest M will give you the smallest u. The smallest M will give you the largest u.

  • Chemistry - , Friday, January 13, 2012 at 11:12pm

    What is RT?

    So for He I would do square root 3 times (value of RT) / 1.0079 correct?

  • Chemistry - , Friday, January 13, 2012 at 11:16pm

    R is 8.314
    T is temperature.
    However, you are asked only for the greatest, not a value. You don't need R or T.

  • Chemistry - , Saturday, January 14, 2012 at 12:40am

    so I just have to compare the molar mass of each gas and the smallest is the greatest?

  • Chemistry - , Saturday, January 14, 2012 at 1:46am

    Yes, if the root mean squared velocity is what you are looking for.

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