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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 = g Magnesium (Mg) = ____ g

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**What about molecules? NaCl has one of each atom**

= = g in one mole of NaCl H20 has 2 hydrogen and 1 oxygen = 2 (1.0079) = g in one mole of H20

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**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 Na2(CO3) CH3OH

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Find the molar mass NH3 CO3 HCl Mg(OH)2 Fe3(PO4)2

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**Converting moles to mass**

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

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**Determine the number of moles:**

25 g Li 251 g F2

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Determine the mass: 2.63 moles of CuSO4 0.73 moles of Mg(OH)2

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**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)

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

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Volume – Gas is $4.00 a gallon Mass – Apples are $1.49 a pound Count – Bananas are $0.79 each How do we measure?

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