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The MOL!

The MOL!. WORDS…UNITS that indicate a number Pair = Dozen = Baker’s dozen = Gross = Ream = Google = Avogadro’s numb = mole. What is Avogadro’s number…. your notes from video. Mole = mol =. 602,200,000,000,000,000,000,000. What is Avogadro’s number…. your notes from video.

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The MOL!

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  1. The MOL!

  2. WORDS…UNITS that indicate a number Pair = Dozen = Baker’s dozen = Gross = Ream = Google = Avogadro’s numb = mole

  3. What is Avogadro’s number… • your notes from video

  4. Mole = mol= 602,200,000,000,000,000,000,000

  5. What is Avogadro’s number… • your notes from video

  6. …here are a few more… • A mole of marbles would fill the _______________________________ …and there would still be enough left over to displace ______________________ ___________________________________________________________________

  7. • Computers can count at the rate of over _________________ At this rate it would take a computer over _________________ to count to 6.02 x 1023

  8. • A mole of hockey pucks would be equal to the mass ____________________________

  9. Assume that each human being has 60 trillion body cells (6.0 x 1013) and the Earth's population is 7 billion (7 x 109 ) The total number of living human body cells on the Earth at the present time is ________________or ________________

  10. A mole, or mol, is a number: 6.022 x 1023 So, 1 mole of C atoms = _________________atoms 1 mole of O atoms = _________________ atoms 1 mole of Cl atoms = _________________ atoms 1 mole of sharks = _________________ sharks 1 mole of puppy kisses = _________________ puppy kisses 1 mole of anything = _________________ anything Remember, a mole is NOT a weight (mass)! It is a COUNT

  11. Useful Info: 1 mole = 6.022 x 1023 atoms 1 mole = molar mass of element Practice with The Mole! #1 2.50 moles Pb = _________________atoms Pb

  12. Useful Info: 1 mole = 6.022 x 1023 atoms 1 mole = molar mass of element Practice with The Mole! #2 8.21 x 1022 atoms Mg = ____________mol Mg

  13. But why would we ever use such a large unit as the mole? ATOMS ARE tiny We can’t directly count them How do we overcome this…how do we know how many we have? We weigh them in a bigger sample! We use the average mass of an atom

  14. A candy shop keeper knows that 10 gumballs have a mass of 21.4 g. What is a possible method to measure out 200 gumballs without actually counting the individual gumballs?

  15. The number of atoms contained in exactly 12 grams of carbon-12 was determined to be 6.02214 x 1023 atoms 1 atom of 12C = 12 amu 1 mole of 12C atoms = 12 g 12 g of 12C = 6.022 x 1023 atoms

  16. Molar Mass from the PT

  17. MOLAR MASS - mass of one mole of a pure substance • Usually written in units of _________________ • For an element, this is the atomic mass from the ___________ • 1 mole = __________________of element • EXAMPLE: 1 mol Fe = _____________ g Fe • 1 mol Al = _____________ g Al

  18. What is the mass of 1 mole of: Hydrogen? Uranium? Mercury? Iodine?

  19. Useful Info: 1 mole = 6.022 x 1023 atoms 1 mole = molar mass of element Practice with The Mole! #3 7.5 mol Ag = ______________ g/molAg

  20. #4 7.50 mol Si = ______________ g/mol Si

  21. #5 5.50 x 104 grams Ag = ______________mol Ag

  22. #6 5.50 x 104 grams Si = ______________molSi

  23. What you need to know: Because atoms are _____________________, we determine their number though ____________…based on a mol of any given element. • A mol is a _________ • It’s value is ____________________ • AKA ___________________ number • The number of _______________________in 1 L, @ 0 C • C-12 was used • The mass of _______________is the same numeric value of _________________

  24. The beauty of it all… • For any element, atomic mass (in amu) = molar mass (in grams) Mass 1 atom H = 1.00794 amu____________= __________ ____________= ___________ 1 mol B atoms = 10.811 g ____________= ___________ ____________= ___________

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