Is a Metric Unit Used for Measuring the ______Of a Substance;
The Mole
· Is a metric unit used for measuring the ______of a substance;
· It is a counting unit like the word “______” or “______.”
· It counts particles
· Its equal to ______particles which is called ______‘s number
Representative Particles
Elements & Compounds are the 2 substances that make up matter. These substances can be broken down into REPRESENTATIVE PARTICLES.
ü The basic particle of an ELEMENT is an ______.
ü The basic particle of an IONIC COMPOUND is a ______.
ü The basic particle of a COVALENT COMPOUND is a ______.
How to convert between MOLES & PARTICLES using dimensional analysis
1. Determine the known and the unknown.
2. Find a conversion factor that will cancel old units out and leave new units
3. Do the math.
Example 1: Convert 3.25 moles AgNO3 to formula units
Example 2: Convert 4.50 x 1024 atoms Zn to moles
Molar Mass
· Is defined as the mass of a mole of particles
· 1 dozen limes and 1 dozen dimes have different masses but the same amount!
· 1 mol carbon and 1 mol magnesium have different masses but the same amount!
· The molar mass of an ______is equal to the ______of the element.
Average atomic mass of element = Molar Mass of element
(amu) (g/mol)
1 atom of CARBON 1 mole of CARBON
= 24.31 amu = 24.31 g/mol
To Calculate the molar mass of a compound
ü Add up the mass of all the elements within the compound
Examples: Calculate the molar mass of:
Cu
How to convert between MOLES & MASS using dimensional analysis
ü Same process as converting between moles and particles but you use a molar mass conversion factor
Example 3: Convert 525 g Ca to moles
Example 4: Convert 2.50 moles (C3H5)2S to grams
How to convert between MASS & PARTICLES using dimensional analysis
ü This is a multistep problem
ü Always convert to moles of the substance first , then to the desired unit.
Example 5: Convert 35.6 g AlCl3 to formula units
Example 6: Convert 49 molecules of C6H12O6 to grams
Example 7: Convert 35.6 g AlCl3 to chloride ions