Torricelli, who invented the barometer, used mercury inits construction because mercury has a very high density,which makes it possible to make a more compact barometerthan one based on a less dense fluid. Calculate the densityof mercury using the observation that the column of mercury is 760 mm high when the atmospheric pressure is1.01 x 105 Pa. Assume the tube containing the mercury isa cylinder with a constant cross-sectional area.

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Q: What is the density of carbon dioxide gas (g/L) at -25.2°C and 91 kPa?

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