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Molar Mass and Mole CalculationsPowerPoint Presentation

Molar Mass and Mole Calculations

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Molar Mass and Mole Calculations

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Molar Mass and Mole Calculations

- 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.

Aluminum Bromide

AlBr3

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

- 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

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 1023 formula units of chromium (III) iodide?