In the Diagram Below,nitrogen Molecules Are Represented by Unshaded Spheres,oxygen

Multiple Choice

In the diagram below,nitrogen molecules are represented by unshaded spheres,oxygen molecules by gray spheres,and chlorine molecules by black spheres.
-If the total pressure in the container is 400.mm Hg,what is the partial pressure of nitrogen?

A) 40.0 mm Hg
B) 80.0 mm Hg
C) 120.mm Hg
D) 200.mm Hg