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bimbot2011 · Feb 9, 2010, 06:48 PM

Can you find the Pressure (kPa) in a gas when you know the number of moles and the absolute temperature?

harum · Feb 10, 2010, 01:02 PM

pV=nRT, this is the equation of state for an ideal gas. You can see that you also need to know the volume of the gas, then you can calculate the pressure:

p = nRT/V

Unknown008 · Feb 16, 2010, 07:51 AM

If, you know the pressure of that gas and that amount of moles at a certain temperature, you can use a shortcut.

$\frac{P_1}{T_1} = \frac{P_2}{T_2}$

Say, one mole of a gas exert a pressure of 101600 Pa at 298 K. You need to find the pressure at 273 K.

So, you get:

$\frac{P}{273\ K} = \frac{101600\ Pa}{298\ K}$

Solve and you're done.