# [SOLVED] Calculating a particles most probable speed

by TFM
Tags: particles, probable, solved, speed
 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 $$V_m_p = \sqrt{\frac{2*k_B*t}{m}}$$ 3. The attempt at a solution $$V_m_p = \sqrt{\frac{2*(1.3807*10^-^2^3)*281}{44}}$$ I have also tried with $$V_m_p = \sqrt{\frac{2*(1.3807*10^-^2^3)*281}{0.044}}$$ with m in kg/mol, but to no avail. I am sure this is the right equation, TFM
 P: 550 The m stands for mass, not mass per mol! Convert the 44g/mol to kg first.
 P: 1,031 It doesn't specify the number of moles, so is it the mass of an individual particle? TFM
P: 1,031

## [SOLVED] Calculating a particles most probable speed

I've just checked and it is.

thanks Nick89

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