How big is a mole? (Not the animal, the other one.) - Daniel Dulek TED TALK

How big is a mole? (Not the animal, the other one.) - Daniel DulekTED TALK • https://www.youtube.com/watch?v=TEl4jeETVmg

Avogadro’s Number 6.02x1023

mole = (mol) 602000000000000000000000 Mole • A mole is just a number like… Pair = 2 Trio = 3 Dozen = 12 Baker’s dozen = 13 Gross = 144 Score= 20 Century=100 Ream=500

How BIG is a mole? There are ~ 6.6 billion people on Earth How many Earths would it take to equal the population of 1 mole? 9.12 x 1013

If you spent $800 billion dollars a day how many years would it take to spend a MOLEion dollars? 2.06 x 109 years

If you had a mole of cats . . . They would create a sphere larger than Earth!

If you had a mole of H2O could you swim in it? NO!  Water molecules are so small that a mole of H2O = 18ml

In chemistry we don’t work with individual atoms or molecules because they are too small to be weighed or measured • We have to work with LOTS of atoms in order to measure them THAT’s WHERE THE MOLE COMES IN!

How small are atoms? • There are more atoms in one gram of salt than grains of sand on all the beaches of all the oceans in all the world.

Mole Song https://www.youtube.com/watch?v=PvT51M0ek5c

of the in Gram ATOMic Mass • mass is in grams of 1 mole of atoms of an element • In other words…… 1 mol C atoms = 6.02 x 10 23 C atoms = 12g C

PracticeRemember . . .1 mole = 6.02x1023atoms or molecules =______ g from the periodic table

Stoichiometry of Chemical Formulas

of the in Gram Formula MassGram Molecular Mass Molar Mass • mass in grams of 1 mole of a substance • In other words . . . Add it all up! 1 mole of NaCl = 58g = 6.02x1023 particles of NaCl 1 mole of H2O = 18g = 6.02x1023 molecules of H20

Now….. • Use the gram formula mass and the gram atomic mass to determine • how many moles or atoms of an element are found in some mass of a substance • how much mass that element contributes to the mass of the entire substance Use factor label & follow the units!

Stoichiometry of Chemical Formulas • If you have 1 molecule of (NH4)2SO4 • How many atoms of N are there? • How many atoms of H? • S? • O? • Total weight?

PracticeRemember . . .1 mole = 6.02x1023atoms or molecules =______ gfm from the pt

Gases ONLY @STP Molar Volume • 1 mole of ANYgas O2 (g) NH3 (g) He (g) contains 6.02 x 1023 molecules and occupies a volume of 22.4L

STP standardtemperature & pressure 0oC or 273K 101.3kPa or 1 atm

Remember . . . • Gases also have mass 1 mole of O2(g) = 32g 1 mole of NH3(g) = 17g  we can calculate Density!

D = m/v • A sample of oxygen contains 3 moles of particles at STP what is its density? • 2 steps • Convert moles to mass AND volume • Calculate density • If mass or volume is given, use it and convert the other……. THEN calculate D!

Remember . . . 1 mole = 6.02x1023atoms or molecules =gfm = 22.4L (g)

“it’s a simple matter of weight ratios . . .” Stoichiometry of Chemical Equations • The study of quantitative relationships that can be derived from chemical equations.

Stoichiometry cookies • If you look at chemical equations as recipes it may be easier to understand that • changing the amount of a reactant will change the amount of the product IN THE SAME RATIO!

Examining Molar Relationships in Balanced Equations 6CO2 + 12 H2O + 2804kJ  6O2 + C6H12O6 +6H20 Balanced equations • Law of conservation of mass / matter • ATOMS are not createdor destroyed during a chemical reaction, they are only rearranged to form new substances. • # atoms on reactant side = # atoms on product side • Law of conservation of E • E on the reactant side = E on the product side

Mole - Mole Relationships Practice

The End

How big is a mole? (Not the animal, the other one.) - Daniel Dulek TED TALK