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Homework Statement
The mercury manometer shown in the figure is attached to a gas cell. The mercury height h is 120 mm when the cell is placed in an ice-water mixture. The mercury height drops to 30 mm when the device is carried into an industrial freezer. HINT: The right tube of the manometer is much narrower than the left tube. What reasonable assumption can you make about the gas volume?
[PLAIN]http://img36.imageshack.us/img36/6331/knightfigure1650.jpg
I'm assuming the temperature is originally at 0C since it says it's in an ice-water mixture. I'm also assuming pressure is constant throughout the problem.
Homework Equations
V/T=V/T
C+273=K
The Attempt at a Solution
I attempted to do:
120/273K = 90/T
T=-68.25C
Wrong answer. I'm guessing there's more to put into the volume part of the equation than just the height, but I don't know exactly what. Can anyone help? Thanks.
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