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Calculating Molar Mass On the periodic table, the atomic mass given is the mass (in grams) of one mole of that atom. –Sodium (Na) Molar Mass = 22.99 g.

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Presentation on theme: "Calculating Molar Mass On the periodic table, the atomic mass given is the mass (in grams) of one mole of that atom. –Sodium (Na) Molar Mass = 22.99 g."— Presentation transcript:

1 Calculating Molar Mass On the periodic table, the atomic mass given is the mass (in grams) of one mole of that atom. –Sodium (Na) Molar Mass = g –Magnesium (Mg) = ____ g

2 What about molecules? NaCl has one of each atom = = g in one mole of NaCl H 2 0 has 2 hydrogen and 1 oxygen = 2 (1.0079) = g in one mole of H 2 0

3 You need to be very careful when counting the number of atoms of each element in a molecule. Count the number of atoms for each element in the molecule: Ca(OH) 2 Na 2 (CO 3 ) CH 3 OH

4 Find the molar mass NH 3 CO 3 HCl Mg(OH) 2 Fe 3 (PO 4 ) 2

5 Converting moles to mass Determine the molar mass of one mole of that molecule Use a conversion factor 1 mole = ____ g (molar mass)

6 Determine the number of moles: 25 g Li 251 g F 2

7 Determine the mass: 2.63 moles of CuSO moles of Mg(OH) 2

8 Volume Applies to gases ONLY at STP: 1 mole = 22.4 L This is referred to as molar volume STP- Standard Temperature (0°) & Pressure (1 atm)

9 How many grams are there in 28.6 L of carbon monoxide?


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