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## Homework Statement

Determine the mean molecular weight of the Martian atmosphere which is composed of 95% carbon dioxide, 3% nitrogen, 1.6% argon. What is the gas constant for 1kg of such an atmosphere?

Using the value for R from the last problem assuming the surface temperature of Mars is 0° C and has a cubic meter of gas weighs 4.6kg what is the surface pressure?

## The Attempt at a Solution

CO2 = 44 g/mol at 95% = 41.8 g/mol

n2 = 28 g/mol at 3% = 0.84 g/mol

Ar = 40 g/mol at 1.6% = .064 g/mol

Martian atmos molecular weight = 42.704

Gas constant = 1/mean molecular weight?

Gas constant using above formula 0.023417

Surface pressure = pv=mRT

P=(mRT)/V

P=((42.704)(0.023417)(273.15))/1

P=273.14988

Is this even close to right?