We use names to measure numbers: How many roses are in a dozen?

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Presentation transcript:

We use names to measure numbers: How many roses are in a dozen? 11.1: The Mole Measuring Matter We use names to measure numbers: How many roses are in a dozen? How many rolls are in baker’s dozen? How many gloves are in a pair? How many sheets of paper are in a ream? How many objects are in a mole?

We use names to measure numbers: How many roses are in a dozen? 12 The Mole: Basic Concepts Measuring Matter We use names to measure numbers: How many roses are in a dozen? 12 How many rolls are in baker’s dozen? 13 How many gloves are in a pair? 2 How many sheets of paper are in a ream? 500 How many objects are in a mole? 6.02x1023 The number that the unit represents is always constant

The mole (mol) is used to measure the amount of a substance. The Mole: Basic Concepts Measuring Matter The mole (mol) is used to measure the amount of a substance. 1 mole = 6.02 x 1023 things = molar mass Avogadro’s number

So… how many apples are in a mole of apples? The Mole: Basic Concepts Avagadro’s number So… how many apples are in a mole of apples? 6.02x1023 apples are in a mole of apples. So… how many water molecules are in a mole? 6.02x1023 water molecules are in a mole. 6.02x1023 particles 1 mol

Just how much is a mole? 1 mol of pennies (6.02x1023 pennies) stacked on top of each other… is 5.64x1017 miles high Distance to the moon = 2.52x105 miles Distance to Pluto = 2.75x109 miles weighs 1.66x1018 tons Weight of the earth = 6.6x1012 tons

That’s a lot! But… 1 mol of water molecules (6.02x1023 H2O molecules) is… 18.0 grams H2O (that’s .634 ounces) 18 mL H2O Hmm… not a lot! Atoms and molecules are so small that using Avagadro’s number makes numbers a lot easier to work with.