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Unformatted text preview: ines up exactly, the cm scale reading is 74.85cm = 748.5mm of mercury. 13 14 Using n=PV/RT to determine n • Our barometer height is measured in cm.
– Convert to mm. Determine the volume of the tube: • 760 mm mercury = 760 Torr at 0oC by definition. Fill the tube with water and weigh it. The volume of the water can be determined from its mass (d=m/V).
dumas.mov – At room temperature, this is still valid to 3 sig figs. • 760 Torr = 1 atm (this is a definition, therefore this is an exact conversion). There is a table of the density of water at different temperatures in the lab manual. • You should read the scale to 4 sig figs.
• But after the conversion, you’ll only have 3 sig figs because of the...
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This note was uploaded on 02/07/2014 for the course CHEMISTRY 030.105 taught by Professor Pasternick during the Fall '06 term at Johns Hopkins.
- Fall '06