Question

What is the rms speed of NO2 at 400K? The mass is 7.64 x10-26 kg/mole.

Answer 1

Answer:

$C_{rms}=465.76\ m/s$

Explanation:

The expression for the root mean square speed is:

$C_{rms}=\sqrt {\dfrac {3RT}{M}}$

R is Gas constant having value = 8.314 J / K mol  

M is the molar mass of gas

Molar mass of $NO_2$ = 0.04599 kg/mol

Temperature = 400 K  

Thus,  

$C_{rms}=\sqrt{\frac{3\times 8.314\times 400}{0.04599}}$

$C_{rms}=\sqrt{\frac{9976.8}{0.04599}}$

$C_{rms}=465.76\ m/s$