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A student collected nitrogen by displacing water in a graduated cylinder. The atmospheric pressure was 746.8 mmHg: the height
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Answer #1


pTotal = patm - pwater height

h1d1 = h2d2

h1 = height of water = 30.2 mm

d1 = density of water = 1 g/cc

h2 = height of mercury = x mm

d2 = density of mercury = 13.6 mmhg

30.2*1 = x*13.6

x = 2.22 mmhg

pTotal = 746.8-2.22 = 744.58 mmhg

pWater = 18.8 mmhg

Ptotal = pN2 + Pwater

744.58 = pN2 + 18.8

pN2 = 725.78 mmhg

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