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Calculating a particles most probable speed

  • Thread starter TFM
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TFM
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[SOLVED] Calculating a particles most probable speed

1. Homework Statement

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. Homework 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
 

Answers and Replies

554
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The m stands for mass, not mass per mol!

Convert the 44g/mol to kg first.
 
TFM
1,026
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It doesn't specify the number of moles, so is it the mass of an individual particle?

TFM
 
TFM
1,026
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I've just checked and it is.

thanks Nick89 :smile:
 

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