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Molarity Lab

Molarity Lab. 4/12/11 Let’s make a solution or 2. 1) With a partner, make 20 milliliters of a 2.0 Molar solution of NaCl. 2)Next, make exactly 175 mL of a 0.147M solution of NaCl.

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Molarity Lab

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  1. Molarity Lab 4/12/11 Let’s make a solution or 2. 1) With a partner, make 20 milliliters of a 2.0 Molar solution of NaCl. 2)Next, make exactly 175 mL of a 0.147M solution of NaCl. 3) How much solution is created, in a 0.45M solution if we use 25.6 grams of sucrose (in yellow packet) to make the solution. Be sure to record the mass of salt used in each. Make this neat and easy for me to read/grade.

  2. Molarity cont. 4) Dilute the 0.147M solution to a 0.08 M solution. How do you do this? What is new volume? How much water? M1V1=M2V2 0.147M(.167L) = 0.08M(V2) V2= 0.307L Add .140 L of water

  3. Daily EQ:What is stoichiometry? warm-up Mole conversions (Do you remember these?) 1) How many moles are there in 500 grams of O2? 2) At STP, how many moles of O2 are in 500 L? 3) How many molecules of O2 are in 25.5 moles of O2? 4) How many atoms are in 25.5 moles of O2?

  4. Stoichiometry Chapter 12 in your book a conversion factor derived from the coefficients of a balanced chemical equation mole ratio- stoichiometry - Calculation of quantities in chemical reactions

  5. N2 + H2  NH3 3 2 Must balance equations correctly Balanced equation can be interpreted in terms of different quantitites. atoms, molecules, moles, mass and volume

  6. N2 + H2  NH3 3 2 Must balance equations correctly What are the 6 mole ratios for the reaction? 3 mol H2 2 mol NH3 1 mol N2 3 mol H2 1 mol N2 2 mol NH3 2 mol NH3 3 mol H2 2 mol NH3 1 mol N2 3 mol H2 1 mol N2

  7. N2 + 3H2  2NH3 How many atoms of each? molecules? moles? mass? volume? Mass and atoms must be conserved but not necessarily molecules, fu,moles, or volume

  8. Practice problems Complete p379 #36 write mole ratios Do #40,41,42

  9. 4/14/11 N2(g) + 3H2(g) 2NH3(g) How many moles of nitrogen are needed to react with 5.2 moles hydrogen gas? How many moles of ammonia (NH3) can be produced from 54 g of nitrogen? How many grams of hydrogen are needed to produce 100.0 grams of ammonia gas?

  10. Limiting reagent • What is it? The thing (reactant) that runs out first, Just like in a recipe. N2(g) + 3H2(g) 2NH3(g) How many moles of nitrogen are needed to completely react with 15 moles of H2 in the above reaction ?

  11. Limiting reagent N2(g) + 3H2(g) 2NH3(g) How many grams of nitrogen are needed to completely react with 8 grams of H2 in the above reaction ? How many grams of NH3 can be produced in this reaction?

  12. Limiting reagent N2(g) + 3H2(g) 2NH3(g) What is the limiting reagentin the above reaction , if 10 moles of hydrogen gas react with 10 moles of nitrogen gas?

  13. Limiting reagent N2(g) + 3H2(g) 2NH3(g) What is the limiting reagentin the above reaction , if 4 grams of hydrogen gas react with 14 grams of nitrogen gas? How many grams of NH3 can be produced in this reaction?

  14. Limiting reagent (cooke method) N2(g) + 3H2(g) 2NH3(g) What is the limiting reagentin the above reaction , if 10 moles of hydrogen gas react with 10 moles of nitrogen gas? Limiting 1 mol 3 mol 10 mol N2 x .33 1 H2 10 mol x Reagent

  15. Limiting Reagents 2AgNO3 + Cu  Cu(NO3)2 + 2Ag • There are 4.3 moles of AgNO3 and 12.3 moles of Cu. Which is the limiting reagent? Limiting 2 mol 1 mol 4.3 mol AgNO3 0.35 2 Cu 12.3 mol Reagent AgNO3 is the limiting reagent. It runs out first.

  16. Limiting Reagents • 2AgNO3 + Cu  Cu(NO3)2 + 2Ag • There are 500g of AgNO3 and 1200g of Cu. Which is the limiting reagent? Limiting 2 mol 1 mol 2.94 mol 500 g 1 mol 1 169.88 g 1200 g 1 mol 1 63.55 g AgNO3 x 0.15 2 Cu 18.9 mol x Reagent AgNO3 is the limiting reagent. It runs out first.

  17. Percent Yield 4/13/10 Actual yield X 100 theoretical yield

  18. Limiting reagent N2(g) + 3H2(g) 2NH3(g) How many grams of nitrogen are needed to completely react with 8 grams of H2 in the above reaction ?

  19. Limiting reagent N2(g) + 3H2(g) 2NH3(g) What is the limiting reagentin the above reaction , if 2 grams of hydrogen gas react with 14 grams of nitrogen gas?

  20. Yeah!TOD 4/15/11 2Al(g) + 3Cl2(g) 2AlCl3(g) 1) List all mole ratios. 2)How many moles of aluminum are needed to react with 5.2 moles chlorine gas? 3)How many moles of aluminum chloride (AlCl3) can be produced from 54 g of chlorine?

  21. Practice problems/Homework Complete p370 #25,26,27,28

  22. Lab demo CuCl2 + Al 

  23. Ticket out the door retake Warm-up 4/15/11 H2(g) + O2(g) H2O(g) How many moles of oxygen are needed to react with 3.7 moles hydrogen gas? How many moles of water can be produced from 12.5 g of oxygen? How many grams of hydrogen are needed to produce 67.0 grams of water?

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