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The question asks me to estimate the mass of carbon dioxide on Venus, Earth and Mars, given ground level pressure, surface temp, surface gravity and the fractional CO2 content.

My initial thought it to use the exponential atmosphere equation:

P(h) = P(0)*exp-(mgh/kT), and solve for m, and multiplying this by the fractional CO2 content. But I don't think that this is the way to go somehow, as I don't have a a value of P(h). And now I'm stumped. Can anyone help me at all (because my notes sure can't!)

Thanks guys