1. The Mole and Avogadro’s Number
Molar Mass
Finding n
Finding the # of atoms
Working with formulas - Practice

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3. We sometimes give a name to a specific amount
Pair = 2
Dozen = 12
Can you think of any more?????

4. The Mole…..
We need a relationship between the mass of a sample of an element/compound and the number of atoms/molecules in that sample
For this, we use the MOLE
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6. The atomic mass (amu) = molar mass (grams/mol)
The Molar mass of anything is the mass of 1 mole of that thing in grams
Coins, chickens, computers, students, etc.
____________
For any element
The atomic mass (amu) = molar mass (grams/mol)

7. What is the mass of one mole of:C Hg Cu Fe

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9. One of THE formulas in Chemistry
n = m M
n = number of moles
m = mass of the sample
M = molar mass

10. Practice Questions 1. How many moles of Na are in 42 g of Na?
3.    How much does 2.18 mol of Cu weigh?
4.    What is the …………….
n = m M

11. The Number of Atoms How do you find the number of atoms? n=m/M
What does n represent?
__________
What is a mole?

12. Easier
Remember the mole represents a number, a really big number but it’s just a number. The …………..
1) How many dozen eggs do you have if you have 4 eggs?
____________
___________
2) How many dozen eggs do you have if you have 18 eggs?
3) How many dozen eggs do you have if you have 12 eggs?

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14. Check Your Understanding: Find the # of particles/atoms
1.    How many atoms are ……………?
2.    How many atoms are in 36 g of bromine?
3.    How many moles are in …………….?
n = # of particles
6.02x1023

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17. Molar Mass
The molar mass of a compound is found by adding together the molar masses of all of its elements, taking into account the number of moles of each element present.
Recall: atomic mass = molar mass if there is 1 mole of substance
___________
e.g. H2 = (we don’t round!) = 2(1.008) = amu
If there is 1 …………..

18. Check Your Understanding: What is the molar mass?
H2O
CO2 CO
C6H12O6

19. Molecular mass (or molecular weight) is the sum of the atomic masses (in amu) in a molecule.
+ 2 x amu
SO2
64.07 amu
____________
1 molecule SO2 = amu
1 mole SO2 = g SO2

20. How many H atoms are in 72.5 g of C3H8O ?
Step 1 – Find the number of Molar Mass of C3H8O

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22. How many H atoms are in 72.5 g of C3H8O ?
Step 3 – Find the number of atoms of H using nH