With the idea of SDP, we are faced with a new idea, the standard molar volume. Now we're going to say that it represents the volume of 1 mole of an ideal gas at STP. All right. So here we're going to say
volume = moles × RT PWe're dealing with one mole of the gas. R is just our constant, and we're going to say we're dealing with STP.
So our pressure will be 273.15 Kelvin and our pressure will just simply be one atmosphere. We see here that the moles cancel out, Kelvin's cancel out, atmospheres cancel out. So here we'll have our volume in liters. When we plug this in, we get 22.24 liters. This would represent our standard molar volume for one mole of gas, an ideal gas.
Now this helps to establish a relationship between moles and volumes. And because we have a relationship between mole and volumes, we can create a new conversion factor. And that conversion factor would be that for any one mole of an ideal gas at STP, its molar volume would be 22.4 liters. So just remember, if we're dealing with STP and we're dealing with one mole of any gas, then its standard molar volume will be 22.4 liters.