1. Stoichiometry a quantitative study of chemical reactions Ex: How many grams of potassium phosphate will react with 100g of magnesium nitrate? How much precipitate will form?

2. First 3 things to learn p.81 Molar mass moleavogadro’s number Formula mass Molecular mass Atomic mass Formula weight Molecular weight Atomic weight Atomic mass units Molar mass is the mass in grams of one mole of the compound Ex) carbon monoxide molar mass = 28.01 grams CO….carbon=12.01amu + oxygen = 16.00 amu ……..28.01 grams sodium chloride molar mass = 58.45 grams NaCl…..sodium= 22.99 amu + chlorine= 35.45amu…….58.44 grams ws-9.0DO NOT ROUND-OFF

3. Ws 9.0

4. Mole or mol Mole ==== dozen cars eggs volcanos Mole = the amount of substance that contains the same number of particles as 12.01 grams of carbon 12. A chemist may want 1mol of Carbon = 12.01grams 1mol of Iron = 55.85grams 1mol of Calcium = 40.08grams 1mol of H 2 0 = 18.016 grams 1mol of FeSO 4 =151.92 grams

5. *** units are just as important as numbers*** ** units tell you to multiply or divide ** 1. How many moles are in 11 grams of Sodium? 2. How many grams in 2.7mol of Phosphorus? 3. How many moles are in 23grams of Krypton? 4. How many grams are in 86.93mol of Calcium? Ws.9.1

6. 5.How many moles are in 5.6 grams of Magnesium? 6.How many grams are in 242 moles of arsenic? 7.How many moles are in 2.7grams of Sodium Hydroxide? 8.How many moles are 52.5 grams of Copper II Sulfate?

7. 9.How many grams are in 75 moles of water? 10.How many moles are in 1.7 x 10 5 grams of methane? 11.How many grams are in 4.3 x 10 -6 moles of Calcium phosphate? 12.How many grams are in 18.37 x 10 -2 moles of silicon dioxide?

8. 13.How many moles in 2.3 x 10 3 grams of potassium sulfide 14.How many grams in 15 moles of hydrochloric acid? 15.How many grams in 132 x 10 5 moles of Manganese? 16.How many grams in 232 x 10 3 moles of aluminum hydroxide?

9. enen 1x 10 2 = hundred 1x 10 3 = thousand 1x 10 6 = 1 million 1x 10 9 = 1 billion 1x 10 12 = 1 trillion l million = spend $1,000.00/day starting today, 1 billion = spend $1000.00/day start day, 600BC--- 1 trillion = spend $1000.00/second……$1.444 million per day need ___________ years to spend it

10. Avagadro’s number = 6.022 x 10 23 One mole of anything has avagadro’s number in it. atoms in it Avagadro’s # 6.022 x 10 23 molecules in it One mole of mm’s will cover the United States…. How deep? 1 mol of Cu has 6.022 x 10 23 atoms 1 mol of Ag has 6.022 x 10 23 atoms 1 mol of H 2 0 has 6.022 x 10 23 molecules 1 mol of CuSO 4 has 6.022 x 10 23 molecules ***word units are as important as the numbers*** “word units tell if multiplying or dividing” “because every experiment is different…...there is no set pattern or formula” “the word unit to eliminate goes opposite”

11. ws.9.03 l.How many molecules in 28grams of Sodium Sulfate? 2.How many moles in 28grams of Sodium Sulfate? 3How many grams in 7.5 x 10 28 molecules of SilverNitrate 4. How many moles in 7.5 x 10 28 molecules of SilverNitrate?

12. 5.How many moles in 120x10 42 molecules of Sodium Chloride? 6.How many molecules in 25g of Sodium Chloride? 7.How many molecules in 122g of Copper II Nitrate? 8.How many grams in 9.4 x 10 25 molecules of hydrogen gas?

13. 9.How many molecules in 230 moles of Cobalt II Chloride? 10.How many moles are in 9.4 x 10 25 molecules of Sulfuric Acid? 11.How many grams are in 9.4 x 1025 molecules of Sulfuric Acid? 12.How many molecules are in 255 grams of Ammonium Hydroxide?

14. 14.How many molecules of Aspirin are in one pill? One pill is.2g. Aspirin(C 9 H 8 O 4 ) 15.How many moles of Aspirin in 2 pills? 16.How many molecules of Cocaine would a drug addict pump in his blood stream if the person used one gram? Cocaine ( C 17 H 21 NO 4 )

15. AP-problem;p.93 Isopentyl acetate is the compound responsible for the scent of bananas. Interestingly bees release about 1ug(1 X 10 -6 g) of this compound when they sting. The resulting scent attracts other bees to join the attack. How many molecules of isopentyl acetate( C 7 H 14 O 2 ) are released in a typical bee sting? How many atoms of Carbon are present?

16. Note: 1 mole of CH 4 contains 1mole of carbon and 4moles of hydrogen