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Bell Ringer

2. 2. 1 mol O 2. 10 mol Mg. 5 mol O 2. x. =. 2 mol Mg. Bell Ringer. Please take out a piece of paper and answer the following question individually : When magnesium metal is burned, it forms MgO. How many moles of oxygen gas are needed to burn 10 moles of Mg? A 2 B 5 C 10

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Bell Ringer

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  1. 2 2 1 mol O2 10 mol Mg 5 mol O2 x = 2 mol Mg Bell Ringer Please take out a piece of paper and answer the following questionindividually: When magnesium metal is burned, it forms MgO. How many moles of oxygen gas are needed to burn 10 moles of Mg? A 2 B 5 C 10 D 20 Mg + O2 MgO VA Chemistry SOL 2003

  2. Homework Answers • Fill in the Blanks: • quantitative • reactant • coefficient • conservation • is • coefficients • Word Problems: • 0.72 mol HCl • 1.0 mol HNO3 • 0.19 mol CO2 • 0.19 mol Al • 180 g I2 • 730 g Cl2 • 7200 g NaCl • 150,000 g Zn 9. 3.3 g H2 10. 1700 g H2O 11. 10 g H2 12. 700 g CO2 500 g O2

  3. Chemistry Key Words When a substance is: • Formed • Produced • Liberated • Created • Prepared IT IS A PRODUCT! When a substance is: • Reacted • Oxidized • Reduced • Needed • Electrolyzed IT IS A REACTANT!

  4. 2 2 How many grams of sodium hydroxide are formed from the reaction of sodium chloride and water? Chemistry Intuition How many moles of oxygen are liberated by the electrolysis of 3 moles of water? electricity H2O O2 + H2 ? NaCl + H2O HOH NaOH + HCl ?

  5. 2 2 Calculate the amount of iron liberated when copper (II) reacts with ferric oxide. 3 2 3 Chemistry Intuition How much zinc is necessary to create 15 grams of zinc oxide? Zn + O2 ? ZnO Cu + Fe2O3 Fe + CuO ?

  6. For Today’s Quiz: 3 2 2 3 points 2 points 2 points 3 points Ca + AlCl3 3 CaCl2 + Al 1 mol Ca 2 mol Al 26.98 g Al c. 1.9 g Ca x x x = 40.08 g Ca 3 mol Ca 1 mol Al 0.85 g Al • For Today’s Quiz: • 2 Mass-Mass word problems, 10 points each • Watch for Significant Figures! • Label EVERYTHING!

  7. Stoichiometry in 3-D! • We have already learned about these three types of conversions: • Mole-Mole • Mass-Mole • Mass-Mass • There are three more types of stoichiometry problems we will deal with today for gases: • Mass-Volume • Volume-Mass • Volume-Volume

  8. Mass-Volume Problems • Step 1: Write a BALANCED EQUATION • Step 2: Convert given substance from mass to moles • Step 3: Determine the mole ratio from the coefficients in the equation and convert from moles of given to moles of required substance • Step 4: Convert the required substance from moles to volume in liters 1 mol = 22.4 Liters

  9. Mass-Volume Problems Example: 2 H2O 2 H2 + O2 How many liters of oxygen are necessary to create 48.0 g H2O? 48.0 g H2O 1 mol H2O 1 mol O2 22.4 L O2 29.8 L O2 x x x = 18.02 g H2O 2 mol H2O 1 mol O2

  10. Volume-Mass Problems • Step 1: Write a BALANCED EQUATION • Step 2: Convert given substance from volume in liters to moles • Step 3: Determine the mole ratio from the coefficients in the equation and convert from moles of given to moles of required substance • Step 4: Convert the required substance from moles to mass in grams using the Periodic Table

  11. Volume-Mass Problems Example: 2 H2O 2 H2 + O2 How many grams of water are formed by reacting 36.0 L O2? 36.0 L O2 1 mol O2 2 mol H2O 18.02 g H2O 58.7 g H2O x x x = 22.4L O2 1 mol O2 1 mol H2O

  12. Volume-Volume Problems • Step 1: Write a BALANCED EQUATION • Step 2: Convert given substance from volume in liters to moles • Step 3: Determine the mole ratio from the coefficients in the equation and convert from moles of given to moles of required substance • Step 4: Convert the required substance from moles to volume in liters 1 mol = 22.4 Liters

  13. Volume-Volume Problems Example: 2 H2O 2 H2 + O2 How many liters of H2 are required to react with 5.0 L O2? 5.0 L O2 1 mol O2 2 mol H2 22.4 L H2 10. L H2 x x x = 22.4 L O2 1 mol O2 1 mol H2

  14. Mole ratio 1 mol H2O 1 mol O2 22.4 L O2 b. 63.07 g H2O x x x = 18.02 g H2O 2 mol H2O 1 mol O2 39.20 L O2 Practice Problems 2 H2O (g) 2 H2 (g) + O2 (g) 1 mol H2O 2 mol H2 22.4 L H2 1. a. 63.07 g H2O = x x x 18.02 g H2O 2 mol H2O 1 mol H2 78.40 L H2

  15. Mole ratio 1 mol H2O 1 mol O2 22.4 L O2 b. 39.2 L H2O x x x = 22.4 L H2O 2 mol H2O 1 mol O2 19.6 g O2 Practice Problems 2 H2O (g) 2 H2 (g) + O2 (g) 1 mol H2O 2 mol H2 22.4 L H2 2. a. 39.2 L H2O = x x x 22.4 L H2O 2 mol H2O 1 mol H2 39.2 g H2

  16. Mole ratio 1 mol O2 6 mol H2O 22.4 L H2O 16.0 g O2 x x x = 32.00 g O2 7 mol O2 1 mol H2O 9.60 L H2O Practice Problems 2 C2H6 (g) + 7 O2 4 CO2 (g) + 6 H2O(g) 1 mol O2 4 mol CO2 22.4 L CO2 3. a. 16.0 g O2 = x x x 32.00 g O2 7 mol O2 1 mol CO2 6.40 L CO2 b.

  17. Mole ratio 1 mol O2 6 mol H2O 22.4 L H2O 5.8 L O2 x x x = 22.4 L O2 7 mol O2 1 mol H2O 5.0 L H2O Practice Problems 2 C2H6 (g) + 7 O2 4 CO2 (g) + 6 H2O(g) 1 mol O2 4 mol CO2 22.4 L CO2 4. a. 5.8 L O2 = x x x 22.4 L O2 7 mol O2 1 mol CO2 3.3 L CO2 b.

  18. For Wednesday’s Quiz: • 2 word problems, 10 points each • mass-volume, volume-mass, volume-volume • Be aware of: • Significant figures • LABELS! Pay attention to the labels given in the problem! LABEL EVERYTHING! • Formulas and equation writing

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