1. 2 step problems/Mixed Practice due tomorrow!
November 30, 2017
2 step problems/Mixed Practice due tomorrow!
QUIZ 12/4
Review Due
12/4
Moles Test
12/5
Extra Credit:
Bubble Gum!
Warm up:
Calculators NEEDED 
Convert 4.5 grams of H2O to molecules of H2O
Convert 3.6x1024 molecules of C6H12O6 to grams
Convert 76.1 g NaCl to FUNs of NaCl
Convert 9.4x1022 FUNs of MgO to moles.
Convert 72 g of Nitric acid (HNO3) to moles

2. Why not atoms of water??????

3. Why are the following substances considered molecules?
Molecules Atoms
FUNs Ions
Why are the following substances considered molecules?
A) C2H6 b) P2O7
Because they have covalent bonds!
How many atoms of each element are in the molecules?
A) C-2, H-6 b) P-2, O-7

4. How many ions are in the following formula units? CuBr2
Cu: 1 Charge: +2
Br: 2 Charge: -1
K2S
K: 2 Charge: +1
S: 1 Charge: -2
PbO
Pb: 1 Charge: +2
O: 1 Charge: -2
Ca3(PO4)2
Ca: 3 Charge: +2
P: 2
O: 8 PO4 charge: -3

5. How many atoms of carbon are in 5
How many atoms of carbon are in 5.1 x particles of table sugar, C12H22O11?
5.1 x 1023 molecules C12H22O11
12 atoms C
1 molecule C12H22O11
= 6.12 x 1024 atoms of Carbon

6. A sample of aluminum oxide, Al2O3, contains 3. 2 x 1021 particles
A sample of aluminum oxide, Al2O3, contains 3.2 x 1021 particles. How many ions of oxygen are in the sample?
3.2 x 1021 FUNs Al2O3
3 ions O
1 FUN Al2O3
= 9.6 x 1021 ions of Oxygen

7. How many ions of sulfur are in 1
How many ions of sulfur are in 1.1 x particles of sodium sulfate, Na2S?
1.1 x 1024 FUNs Na2S
1 ion S
1 FUN Na2S
= 1.1 x 1024 ions of Sulfur
Practice – you try!

8. 3 Step problems THIS IS THE HARDEST TYPE OF PROBLEM!!!
Mass Moles Molecules Atoms
FUNS Ions
3 Step problems

9. How many atoms of oxygen are in 67.8 g of H2O?
1 mol H2O
67.8 g H2O
6.02 x 1023 molecules
1 O atom
18 g H2O
1 mol H2O
1 H2O molecule
= 2.27 x 1024 atoms of Oxygen

10. A flask contains 32. 5 g of strontium chloride, SrCl2
A flask contains 32.5 g of strontium chloride, SrCl2. How many chlorine ions are in the flask?
32.5 g SrCl2
1 mol SrCl2
2 Cl ions
6.02 x 1023 FUNs
158 g SrCl2
1 mol SrCl2
1 SrCl2 FUN
= 2.48 x 1023 ions of Chlorine

11. How many ions of sulfate, SO42-, are in 45
How many ions of sulfate, SO42-, are in 45.6 g of aluminum sulfate, Al2(SO4)3? Round your answer to 3 sig figs
45.6 g Al2(SO4)3
1 mol Al2(SO4)3
6.02 x 1023 FUNs
3 SO42- ions
1 Al2(SO4)3 FUN
342 g Al2(SO4)3
1 mol Al2(SO4)3
= 2.41 x 1023 ions of SO42-
You try!

12. A sample of carbon tetrachloride, CCl4, contains 3
A sample of carbon tetrachloride, CCl4, contains 3.5 x 1024 atoms of chlorine. How many grams of CCl4 are in the sample?
3.5 x 1024 atoms Cl
1 FUN CCl4
152 g CCl4
1 mol CCl4
1 mol CCl4
4 atoms Cl
6.02 x 1023 FUNs
= g CCl4
You try!

13. A sample of nitrogen monoxide, NO, contains 2.6 x atoms of oxygen. How many moles of nitrogen monoxide are in your sample?
2.6 x 1026 atoms O
1 molecule NO
1 mol NO
1 atom O
6.02 x 1023 molecules NO
= mol NO
You try!