 #  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.

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 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)

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.

 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.

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

 To find the molar mass of AlBr 3, 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 AlBr 3 per mole or 266.6935 g/mol AlBr 3

Where, n is the # of moles (mol) m is the mass (g) M is the molar mass (g/mol)

 What is the mass of 4.72 x 10 23 formula units of chromium (III) iodide?

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