Wake-up
1. How many moles are in 3.4 x 10-7 g of silicon
dioxide?
a. Formula of silicon dioxide
b. Molar mass of silicon dioxide
c. Answer question
Molar Volume Conversions
What is STP?
How do you convert volume to moles?
Review Volume
The amount of space that a substance or object
occupies
Remember Avogadro?
In 1881, he stated that equal number of gas particles
at the same temperature and pressure have the
same volume.
Mole Road Map
Moles to Volume
Or
Volume to Moles
STP
Standard Temperature and Pressure
The standard temperature is 273 K (0° Celsius) and
the standard pressure is 1 atm (atmosphere)
pressure.
STP and Moles
At STP, one mole of gas occupies 22.4 L of volume
(molar volume).
Conversion Factor for Volume at STP
and Moles
Practice Problems
What is volume of a balloon that holds 1.78 mol of
oxygen gas at STP?
Practice Problems
How many moles of Helium at STP will fit into a
39.6L container?
Practice Problems
What volume will 0.416g of Krypton gas occupy at
STP?
Practice Problems
What volume is occupied by 100.0g of propane gas
(C3H8) at STP?
Practice Problems
Methane has the formula CH4. Calculate the mass of
2.75L of this gas at STP.