CHEM101 Lecture Notes - Lecture 20: Ideal Gas Law, Partial Pressure, Intermolecular Force
25 May 2018
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CHEM101 – Lecture 20
Dalton’s Law of Partial Pressures
• Partial pressure- the pressure exerted by one gas in a mixture of gases
• Total pressure equals partial pressure of gases A, B, C (etc.) in mixture
Example:
Collecting gas over water
• Total pressure of the gas will be equal to the sum of the parts (whatever gas you are
collecting in the reaction) and the pressure of water
Example:
Volume gas collected is and atmospheric pressure of 765 torr. How many grams
of were decomposed?
• Step 1: Partial pressure
• Step 2: Ideal Gas Law
