A capillary tube of uniform diameter contains gas samples A and B, separated by a short column of Hg, l mm in length. The ends are sealed. In a horizontal position, the confined gases occupy a mm and b mm in length with a common unknown pressure (P). In vertical position (gas A upward), the lengths become respectively a mm and b mm. The P is equal to (in mm Hg):
l(aa′−bb′)
l(aa′−bb′)
l(bb′−aa′)
l(bb′−aa′)
A
l(bb′−aa′)
B
l(aa′−bb′)
C
l(aa′−bb′)
D
l(bb′−aa′)
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Solution
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By ideal gas law: PV=nRT For a particular gas since n and T are constant. ⇒PV=Constant
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