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_{0i}e

^{−Migz/RT}where Pi is the partial pressure at the height z, P

_{0i}is the partial pressure of component i at sea level, g is the acceleration of gravity, R is the gas constant, T is the absolute temperature, and M

_{i}is the molecular mass of the gas. As a result of turbulent mixing, the composition of Earth's atmosphere is constant below an altitude of 100 km, but the total pressure decreases with altitude as P=P

_{0}e

^{−Mavegz/RT}where M

_{ave}is the mean molecular weight of air. At sea level, x

_{N2}= 0.78084 and x

_{He}= 0.00000524 and T= 300. K.

Im not really sure where to start with this. I figured maybe just start with the exponent of e and im confused right off the bat. using the info give it would be e^(28.9 g mol

^{-1})(9.81m s

^{-2})(6500m)/(300k)(R).....so im not sure what R to use, also i sort of remember something about e not being able to be raised to something with units and i end up with all kinds of units left all over the place?