A gas sample is connected to a closed-end manometer. The difference in mercury levels in the 2 arms is 115 mm. What is the gas pressure in torr if the atmospheric pressure is 750. torr?

Answer 1

I don't know the arrangement of your apparatus but here is a site that should help you.
http://www.google.com/imgres?imgurl=http://www.chem.ufl.edu/~itl/2045/matter/FG10_003.GIF&imgrefurl=http://www.chem.ufl.edu/~itl/2045/lectures/lec_a.html&h=400&w=600&sz=23&tbnid=IIcjVWM9l5H2fM:&tbnh=90&tbnw=135&prev=/images%3Fq%3Dclosed%2Bend%2Bmanometer&zoom=1&q=closed+end+manometer&usg=__FVrF2hWt-RoIs4gIYvvtQ3F-lgs=&sa=X&ei=iby0TK2bIsWAlAf779TzCg&ved=0CCoQ9QEwBA