November 14, 2010 by USA Post 

PV NRT, The ideal gas law (PV = nRT) is unlike the other gas laws in that it does not require an initial and a final state, ie it does not require the situation changes in order to determine a value for pressure, volume, amount of gas or temperature.

PV = nRT

When R * = 0.082 atm L / mol * K

We can determine the pressure, volume, temperature or quantity of gas (n) when others are known. For this we must use in atmospheres of pressure, volume in liters, the amount of gas in moles and the temperature in Kelvin.

If you know the pressure, temperature and volume of a gas, you can determine the number of moles.

Pressure = 1.4 atm

Volume = 500 ml -> convert to liters -> 0.5 L

Temperature = 20 degrees Celsius -> Kelvin convert -> 293 K

This gives us:

PV = nRT

(1.4 atm) (0.5 L) = (n) (0.082 L atm / mol * K) (293K)

n = 0.029 mol

To standardize the research and results, use a normal temperature and pressure

The temperature and pressure are 273K and 1 atm.

If we plug the numbers into the equation for a quantity of 1 mol we obtain the volume of one mole of any gas:

PV = nRT

(1 atm) (V) = (1 mol) (0.082 L atm / mol * K) (273K)

V = 22.4 L

The volume of gas S.T.P. is 22.4 liters.

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