Conversions
When converting between units:Draw a t-chartFill it inMultiply across and divide by the bottom
GIVEN WHAT YOU WANT
UNITS OF GIVEN
Example:12 inches in 1 footConversion Factor: 12 inches = 1 foot
Remember:1 mole = atomic mass (g)1 mole = molar mass (g)
How many moles of Na atoms are there in 46.0 g of Na?
46.0 g Nag Na
mol Na
= 2.00 mol Na
23.001
How much would 2.34 moles of carbon weigh?28.10 g C
How many moles of magnesium is 48.62 g of Mg?2.00 mol Mg
How many moles is 5.69 g of NaOH?
5.69 g NaOH
g NaOH
mol NaOH
Na = 23.00g O = 16.00 g H = 1.01 g 1 mole NaOH = 40.01 g
1
40.01= 0.14 mol
NaOH
How many moles is 4.56 g of CO2?0.10 mol CO2
How many grams is 9.87 moles of H2O?177.86 g H2O
A moles meaning doesn’t stop there!
When we weigh a mole the mass is made up of an amount particles!
This # never changes even when the identity of the atoms changes.
The # of atoms in a mole is called,Avogadro's Number = 6.022 x 1023
1 MOLE = 6.022 x 1023 particlesatoms
moleculesformula units
The mole concept allows us to count atomsmoleculesformula unitsparticles
1 MOLE = 6.022 x 1023 atoms
So how many atoms are in 3 mol of Al?
3 mol Al 6.022 x 1023
mol Al
= 1.81 x 1024 atoms of Al
1
atoms Al
How many moles are in 3.0 x 1023
atoms of Al?
3x1023 atoms of Al
6.022 x 1023 atoms of Al
1 mol Al
= 0.498 mol of Al
How many molecules is 6.8 mol of CH4?4.09x 1024 molecules CH4
4.9 x 1023 particles of C6H12O6has how many moles?
0.814 mol C6H12O6