Posted by Amy on Wednesday, January 23, 2013 at 6:19pm.
First convert that 18.2 cm to how much pressure was exerted. The pressure of a column of water 18.2 cm high is
density x gravity x height = 1.00g/cc x 9.8 m/s^2 x 0.182m = 1.78 kPa and since the height in the buret is too high, that means the pressure on the gas inside is 1.78 kPa too much. I would convert that to mm and subtract from 748. I estimate the mm Hg for 1.78 kPa to be about 13 or so mm Hg.(You can do it another way as follows: 18.2 cm = 182 mm and 182mm/13.6 = 13.4 mm Hg)
a.
Ptotal gas = pH2O level + pH2O vapor pressure at 22C + pH2.
You know Ptotal= 748 mm
You know added pressure due to height H2O = about 13 mm (you should do that more accurately) and you can look up the vapor pressure of H2O at 22 C.
b.
Use PV = nRT to calculate n for H2 gas.
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