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Molar Mass and Mole Calculations. Molar Mass. Molar mass is the mass in grams of one mole of particles (atoms, ions, molecules, formula units). Equal to the numerical value of the average atomic mass (get from periodic table) 1 mole of C atoms = 12.0 g 1 mole of Mg atoms = 24.3 g

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molar mass
Molar Mass
  • Molar mass is the mass in grams of one mole of particles (atoms, ions, molecules, formula units).
  • Equal to the numerical value of the average atomic mass (get from periodic table)

1 mole of C atoms = 12.0 g

1 mole of Mg atoms = 24.3 g

1 mole of Cu atoms = 63.5 g

  • So, Molar Mass is the atomic mass expressed in units grams/mole (g/mol)
molar mass1
Molar Mass

Chlorine has an atomic mass of 35.453 amu.

So what is its molar mass?

35.453 grams per mole

The number is the same, just change the unit.

molar mass2
Molar Mass
  • How do we find the molar mass of a compound?
    • Find the molar mass of each element in the compound
    • Determine how many of each element are in the compound.
    • Multiply the number of each element by its molar mass.
    • Add these mumbers.
molar mass3
Molar Mass

Aluminum Bromide

AlBr3

In one mole of Aluminum Bromide, there is 1 mole of aluminum atoms and 3 moles of bromine atoms.

molar mass4
Molar Mass
  • To find the molar mass of AlBr3, we do the following:

1 mol Al x 26.9815 g/mol Al = 26.9815 g Al

3 mol Br x 79.904 g/mol Br = 239.712 g Br

26.9815 g Al + 239.712 g Br = 266.6935 g AlBr3 per moleor 266.6935 g/mol AlBr3

mole calculations
Mole Calculations

Where, n is the # of moles (mol)

m is the mass (g)

M is the molar mass (g/mol)

mole calculations1
Mole Calculations
  • What is the mass of 4.72 x 1023 formula units of chromium (III) iodide?
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