Answer and Explanation:
[tex]Greetings![/tex]
[tex]Let's~answer~your~question![/tex]
[tex]Partial ~pressure ~of ~gas ~can ~be ~directly~ calculated ~by ~multiplying ~the~ percentage\\ of~ pressure~ of~ gases~ to ~the ~total ~pressure.[/tex]
[tex]\boxed{Pgas~ = ~P~total~ * \% ~P ~of ~gas}[/tex]
For % of N2 gas:
[tex]100\% - (5\% + 12\%) = 83\% ~N2[/tex]
[tex]PN_2 ~= ~146~ atm~ *~ 0.83 ~ = 121.18 ~atm[/tex]
[tex]PO_2 ~= ~146~ atm~ *~ 0.12~ = 17.52 ~atm[/tex]
[tex]~PCO_2~ = ~146~ atm ~* 0.05 = 7.3 ~atm[/tex]