The Mol.

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Presentation transcript:

The Mol

What is a mol? Mol Any of various small insectivorous mammals living chiefly underground, and having velvety fur, very small eyes, and strong forefeet. NO!! A representative amount of the particles in a substance How many atoms/molecules/formula units there are

You Just won the Chemistry Lottery!! GUESS WHAT! You Just won the Chemistry Lottery!!

6.02 * 1023 dollars!! You hit it big. You just won: However, in order to collect it you must count the money first to make sure it is all there Do you accept your huge jackpot?

Let’s see how long it would take 6.02 * 1023 dollars Lets say you can count 100 dollars per second That means you only have to count for: 6.02 * 1021 seconds If we count every second, of every hour, of every day…how many days would that be? 6.97 * 1016 days How many years? 190,762,288,640,454!!

How big is the mol? 1 mol of $1 bills stacked one on top of each other Reaches to the moon and back 80 billion times! 1 mol of watermelon seeds The watermelon would be as big as the moon!! If we had 1 mol of marbles spread across the entire Earth Would be 3 miles thick! 1 mol of pennies given to every human on Earth Everyone would have a trillion dollars!! 1 mol of sugar in your hand More atoms than stars in our sky!!

Why do we use the Mol? 1 mol = 6.02 * 1023 atoms/molecules/formula units Called Avogadro’s Number Why do we care for the mol? Atomic Masses of elements and compounds are with the mol 1 mol of Fe = 55.845 grams = 55.845 amu What does this mean? In 55.845 grams of iron there are 6.02 * 1023 atoms of iron

Practice Problems What is the molar mass of MgSO4? What is the molar mass of Sodium? 22.9898 grams What is the molar mass of Aluminum? 26.9815 grams What is the molar mass of MgSO4? Mg = 24.3050 grams S = 32.065 O = 15.9994 * 4  63.9976 Add them up and round answer to least amount of sig figs (5) 63.9976 + 32.065 + 24.3050 = 120.37 grams

Practice Problem Set What is the molar mass of Al(OH)3? 78.0036 grams What is the molar mass of ZnSO4? 161.47 grams What is the molar mass of hydrogen? 2.01588 grams How many mols are there in 100.0 grams of NaCl?