CHM 1301 Lecture Notes - Lecture 4: Molar Mass, Van Der Waals Equation, Barometer

• School: University of Ottawa
• Department: Chemistry
• Course: CHM 1301
• Professor: Mathew L

Document Summary

Gas: a fluid that expands, contracts, and flows freely to take on the size and shape of its container. Gases can be defined by their volume (v), temperature (t), and the moles (n) Gases are most sensitive to pressure (p) Pressure: the force (newton or n) applied per unit area (m2) Ambient atmosphere exerts pressure on the surface of the earth. We can measure atmospheric pressure using a barometer. A barometer measures the difference in the pressure exerted by the atmosphere and the height of the mercury in a column. The standard atmospheric pressure (atm): pressure exerted to sustain a column of mercury 760 mm in height. Note that 760 mmhg = 760 torr. The si units for pressure is pascal (pa) The si unit for pressure is pascal (pa) By international convention, 1 atm = 1. 01325 x 105 pa. How can we interconvert units of pressure: 1 atm = 760 torr = 760 mm hg.