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Calculating a particles most probable speed

  1. Apr 24, 2008 #1

    TFM

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    [SOLVED] Calculating a particles most probable speed

    1. The problem statement, all variables and given/known data

    Diatomic carbon dioxide gas (CO2) has molar mass of 44.0 g/mol is at a temperature of 281 Kelvin.

    Calculate the most probable speed .

    2. Relevant equations

    [tex] V_m_p = \sqrt{\frac{2*k_B*t}{m}} [/tex]

    3. The attempt at a solution

    [tex] V_m_p = \sqrt{\frac{2*(1.3807*10^-^2^3)*281}{44}} [/tex]

    I have also tried with

    [tex] V_m_p = \sqrt{\frac{2*(1.3807*10^-^2^3)*281}{0.044}} [/tex]

    with m in kg/mol, but to no avail. I am sure this is the right equation,

    TFM
     
  2. jcsd
  3. Apr 24, 2008 #2
    The m stands for mass, not mass per mol!

    Convert the 44g/mol to kg first.
     
  4. Apr 24, 2008 #3

    TFM

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    It doesn't specify the number of moles, so is it the mass of an individual particle?

    TFM
     
  5. Apr 24, 2008 #4

    TFM

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    I've just checked and it is.

    thanks Nick89 :smile:
     
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