Warm-Up Read this: A counting unit is a unit that we use to name specific quantities of items. For example, if you want to say you have 12 eggs, what.

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Presentation transcript:

Warm-Up Read this: A counting unit is a unit that we use to name specific quantities of items. For example, if you want to say you have 12 eggs, what is another way of phrasing that? Write this: Using that information, write down as many examples of counting units as you can think of. In the Prompt box today write: “Counting Units”

Warm-Up Turn in your Unit 4 Reflections

The Mole

The Mole A counting unit for atoms and molecules! 1 mole = 6.022 x 1023 items SI base unit for amount Symbol = mol

Amedeo Avogadro Italian scientist who determined that at a given temperature, every gas will have the same number of particles per unit volume NA = 6.022 x 1023

Who Cares? 1 mole of a gas will have a volume of 22.4 L at STP (0 oC and 1 atm). 1 mole of a substance will have a mass in grams equal to the average atomic mass given on the periodic table.

Calculating Molar Mass To carry out a chemical reaction, you need 1 mole of zinc nitrate, Zn(NO3)2. How many grams will you need to get for this reaction?

Molar Mass Practice Calculate the molar mass of these three substances: H2O NaHCO3 (NH4)3PO4

Hydrates An ionic compound that has water incorporated into its structure is called a hydrate. Examples: MgCl2· 6 H2O CuCl2· 2 H2O CoCl2 (anhydrous) CoCl2 · 6 H2O (hydrate)

Hydrate Molar Mass You need 1 mole of copper (II) chloride to perform a reaction, but you only have its dihydrate in your stock room. How many grams should you collect for this reaction?

It’s Baaaaack…….. If we know any of the quantities of a substance in the picture, we can convert to any of the others. Particles to moles Moles to volume (for a gas) Particles to mass Take a guess at what method we use to do this…

Dimensional Analysis A small container of compressed gas contains 4.70 moles of Helium. What volume will this gas occupy at STP?

Warm up Finish practice problems from yesterdays notes. Remember the conversions factors of Mole Island: 1 mole = 6.022 x 1023 particles 1 mole = molar mass 1 mole = 22.4 L (only when at STP!)

Dimensional Analysis I have 0.50 moles of Cu(NO3)2. How many grams do I have?

Dimensional Analysis How many moles is 2.408 x 1024 molecules of sugar?

Dimensional Analysis How many grams are in 38.8 L of hydrogen gas at STP?

Mole Song Chorus: A mole is a unit. Or have you heard, It’s 6x1023 ? That’s a 6 with 23 zeros at the end Far too big a number to comprehend.