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 900 mm Hg,what is the partial pressure of nitrogen?

A) 90 mm Hg
B) 180 mm Hg
C) 270 mm Hg
D) 450 mm Hg