Physical Chemistry calculations

Answer all parts.

1) Consider the composition of the atmosphere and how human activity has changed it over time.  

See this website data from NASA:

a. Calculate the partial pressures of CO2 (0.0407%) and CH4 (0.00018%) as reported for 2019 (in dry air) when the total pressure is 1.00atm.

b. Calculate the root mean squared speed of CO2 and CH4 molecules at 1.00atm and 20.0C. 
c. Ozone in the stratosphere protects the earth’s surface from UV radiation. The peak ozone concentration occurs at an altitude of 32km at 15ppm. ( The pressure at this altitude is approximately 122Pa and temperature approximately -195C. Calculate the partial pressure of ozone under these conditions.
d. Calculate the mean free path of ozone under these conditions assuming collisions with N2, the majority component of the atmosphere. (The collision cross-section for ozone  = 0.60 nm2. )

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