February 21, 2017

Homework Help: Physics

Posted by Oli on Monday, May 19, 2008 at 8:57am.

A sealed container of volume 0.10 m3 holds a sample of 3.0 x 10^24 atoms of helium gas in equilibrium. The distribution of speeds of helium atoms shows a peak at 1100 ms-1.

Caluculate the temperature and pressure of the helium gas. (helium atom 4.0 amu)

How do I calculate the mass of helium? I got 2.0 x 10^-2 kg from (sample size/avogrado's constant) x 4.0 x 10^-3 kg.
Is this correct as when I put it into

T = (v^2 x m)/2k

I get a huge temp in the 8^30 K region which cannot be right!

What am I doing wrong here?

When I get the temp I can get the pressure from the ideal gas equation.

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