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## Homework Statement

Hey guys. Hope you can help me out on this one. so heres the question:

At an altitude of 50km the average atmospheric temperature is 0^oC. What is the average number of air molecules per cubic centimeter at this altitude.

## Homework Equations

M = 28.97 g mol^-1

g = 9.81 ms^-2

R = 8.314 J K^-1 mol^-1

Ph = pressure at any given height

P0 = pressure at sea level

Ph = P0e^-Mgh/RT

## The Attempt at a Solution

Ph = P0e^-Mgh/RT

p @ 50km = 75.944Pa

75.944 x 1 x 10^-6

Ph = -------------------

8.314 x 273

= 3.346 * 10^-8. And then I need to divide this by 6.022 * 10^23

= 5.556 * 10^-32. Is this correct?

Cheers :)