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Calculating a particles most probable speed

by TFM
Tags: particles, probable, solved, speed
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Apr24-08, 01:23 PM
P: 1,031
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,

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Apr24-08, 01:29 PM
P: 550
The m stands for mass, not mass per mol!

Convert the 44g/mol to kg first.
Apr24-08, 01:35 PM
P: 1,031
It doesn't specify the number of moles, so is it the mass of an individual particle?


Apr24-08, 02:16 PM
P: 1,031
Calculating a particles most probable speed

I've just checked and it is.

thanks Nick89

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