Equal volumes of gases contain equal numbers of molecules Volume of a gas varies directly with the number of molecules if pressure and temperature stay constant Standard Molar Volume Volume occupied by 1 mole of a gas at STP ID: 931286
Download Presentation The PPT/PDF document "Molar Volume Avagadro’s Principle" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Molar Volume
Slide2Avagadro’s Principle
Equal volumes of gases contain equal numbers of molecules
Volume of a gas varies directly with the number of molecules if pressure and temperature stay constant
Slide3Standard Molar Volume
Volume occupied by 1 mole of a gas at STP
22.414 L/mole
One mole of any gas occupies 22.414 L at STP
Slide4Examples
What volume will 3.75 moles of O
2
occupy at STP?
How many moles in 1.5 L of H
2
at STP?
Slide5Examples
A chemical reaction produced 45.0ml of Nitrogen gas at STP. What is the mass of the gas produced?
What volume will 88g of carbon dioxide occupy at STP?
Slide6Partial Pressure
In a mixture of gases, the total pressure of the mixture is the sum of the pressures of each gas
P
air
= P
nit
+ P
ox
+ P
H
+ …..
Slide7We can find out the pressure in the fourth container.
By adding up the pressure in the first 3.
2 atm
1 atm
3 atm
6 atm
Slide8Gas Collection
When pure gases are collected over water, some water vapor will be present in the gas
The total pressure of the gas is equal to the pressure of the gas plus the pressure of the water vapor
P
T
= P
G
+ P
wat
Slide9Slide10Pressure of Water Vapor Depends on the Temp
Slide11Example
A gas is collected over water on a day where the atmospheric pressure is 755mmHg and the temp is 20
°C. What is the partial pressure of the gas?