What is R? So, from experimental results, data shows that a temperature of zero Celsius and a pressure of one ATM and any 1 Mol of any gas will give us 22.4 liters of volume. And that means we have four unknowns. I mean, we have four knowns and one unknown. And that means if we plug the four knowns in, we'll get our unknown, namely our constant R.
So let's plug these guys in P times V divided by T times N. Simply rearrange these guys, plug our values in, and we get our gas constant R is equal to 0.826 atmospheres times literally by Kelvin times Mo. Now, this number might change if we play around with the units.