Answer:
Option B
0.36 atm
Explanation:
Pt= P1+P2+P3
where Pt is the total pressure, P1, P2, P3 are pressure for respective gases
Substituting 0.9 atm for Pt, 0.26 for P1 and 0.28 for P2 then
0.9 at= 0.26 atm + 0.28 atm + P3
P3= 0.9-0.26-0.28= 0.36 atm
Therefore, the partial pressure of ammonia is 0.36 atm