A mixture of the gases N2, O2, and He has a total pressure of 760 ...

[Alainaaa8]

A mixture of the gases N2, O2, and He has a total pressure of 760 mm Hg. If the partial pressure of N2 is 90 mm Hg and of O2 is 270 mm Hg, what is the partial pressure of He?
 
  A) 1120 mm Hg
  B) 760 mm Hg
  C) 400 mm Hg
  D) 360 mm Hg
  E) 120 mm Hg

Question 2

In a gas mixture of 35 He and 65 O2 the total pressure is 800 mm Hg. What is the partial pressure of O2?
 
  A) 35 mm Hg
  B) 65 mm Hg
  C) 100 mm Hg
  D) 280 mm Hg
  E) 520 mm Hg

[rachel]

Answer to Question 1

C

Answer to Question 2

E