First, you may want to delete one of your posts - since you double posted and one of these will eventually be locked by a moderator.
Secondly, I am not sure how you solved the first part, but I do know that however you solved it, do the same thing except when you get to the actual gases of CO2, H2O, N2, and O2, use only the moles (or grams) for the gases but with P. So instead of finding the partial pressures of ALL the gases use just PCO2, PH2O... instead of the total of all four gases.
Hope this helps,
The Cancer Curer