the molar mass lesson 2. molar mass the atomic mass of an element is the relative mass of the...
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Molar Mass
The atomic mass of an element is the relative mass of the element. It is measured in grams and found on the periodic table.
The molar mass is the mass of one mole of particles and the unit is grams/mole.
Let’s see where to find it on the periodic table!
To find the Molar Mass
Consider the molar mass of all the atoms involved:
CO2
1 ( 12.0 ) + 2 (16.0)
= 44.0 g/mole.
Formula Molar Mass (g/mol)
1H 1.0 g/mole
4.0 g/moleHe
CO244.0 g/mole
Fe2O3159.6 g/mole
Al(NO3)3 .5H2O
Ni2(CO3)3297.4 g/mole
Particles Moles Grams
1.00 mole = 6.02 x 1023 particles Molar Mass
From Periodic Table? g / mole
The molar mass is a new conversion factor that can convert between grams and molesAvogadro’s number is another conversion factor that can convert between moles and particles
Convert 56.6 grams of C to moles.
Don’t forget sig figs!
3 sig figs
= 4.72 molesx 1 mole12.0 g
56.6 g
Convert 2.00 g CH4 into molecules
grams moles molecules
= 7.51 x 1022 moleculesx 6.02 x 1023 molecules1 mole16.04 g
x 1 mole2.00 g CH4
Convert 9.56 x 1026 molecules Cl2 into grams.
molecules moles grams
= 1.13 x 105 g x 71.0 g
6.02 x 1023 molec
x 1 mole 9.56x1026 molec Cl2
1 mole
Try: Convert 8.66 x 1024 particles of CaCl2 into grams
particles moles g
Happy Mole day to You
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