
CP Sci 9 1st Sem. Gen Chem  1st Sem. 
Mole Conversions Objectives: 1. Explain how to convert between the number 2. Define molar volume of a gas. 3. Determine how to determine the number of particles in a given volume of gas at STP. Key Terms: molar volume Notes: (102) The mole serves one very important function in scientific equations. The mole is able the measure both mass and particles. Because of this dual nature the mole is the central unit when converting from one type of measurement to the other. Rules for converting moles to mass.
example: 2.50 mol NaCl
example: 58.5g NaCl / 1mole NaCl
example:
2.50
Rules for converting mass to moles.
example: 11.2g NaCl
example: 1mole NaCl / 58.5g NaCl
example:
11.2
Moles to particles: Going further
example:
11.2
example: 6.02 x 10^{23} / 1mol
example:
0.191
example:
11.2 Box Method: (My way of keeping the units organized)
Molar equivalency of gases: The mole pertains to all phases of matter. The difference between the gas and other matter is that gas will expand until it fills a container. Therefore, it is important to impose a few rules on gas in order to predict its molar mass and volume. STP  Standard Temperature and Pressure
Under these conditions (STP) it has been experimentally proven that all gases occupy 22.4L (dm^{3}) of space. .
example: 1.0L CO_{2}
example: 1mol CO_{2} / 22.4L CO_{2}
example:
1.0
Put it all together: Solve for mass: example:
1.0 Solve for particles: example:
1.0

Last modified: September 05, 2004 