CHEM 120 Lecture Notes - Lecture 2: Stoichiometry, Gas Laws, Atmospheric Pressure

• School: McGill University
• Department: Chemistry
• Course: CHEM 120
• Professor: Laura Pavelka

Document Summary

Chem 120 lecture 2 gas laws. Liquid pressure: columns * p = gdh * The pressure exerted by a liquid depends on: height of column, density of liquid, and gravity, regardless of shape of column. Atmospheric pressure units: 760 mmhg, 1 atm, 101. 325 kpa, 760 torr, 101325 pa, Manometers: measuring the pressure of a confines volume of gas. Difference in meniscuses heights = deltap = ghd. Pgas = pbar + ldeltapl * if pgas > pbar. Pgas = pbar ldeltapl * if pgas < pbar. If gas p = p atm(or bar) then heights of meniscuses are equal. Simple gas laws are relationships between pairs of gas properties (p, v, t, n) An "ideal gas is a gas that obeys the simple gas laws perfectly. Real gases can behave like ideal gases over a range of conditions (will see in more detail later) In 1662, robert boyle discovers the 1st gas law using a manometer.