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Molar Mass and Chemical Reactions

Molar Mass and Chemical Reactions. September 19, 2012 Ms. Boon Chemistry. Catalyst. Pick up your assignment report. Make a list of at least 3 things you are proud of concerning your academic achievements this year.

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Molar Mass and Chemical Reactions

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  1. Molar Mass and Chemical Reactions September 19, 2012 Ms. Boon Chemistry

  2. Catalyst • Pick up your assignment report. • Make a list of at least 3 things you are proud of concerning your academic achievements this year. • Make a list of at least 3 things you would like to improve about your school work.

  3. Shout Outs! (Period 2) • The following students demonstrated mastery (3 or 4) of all the Unit 2 standards on their Unit 2 exam: • Edgardo Aguilar & Denise Montes • The following students have demonstrated mastery of all Unit 2 standards on average: • Christian Romo, Zamir Ramirez, RumaldoGodinez, and Susan Castellanos

  4. Shout Outs! (Period 3) • The following students demonstrated mastery (3 or 4) of all the Unit 2 standards on their Unit 2 exam: • Eduardo Cabral, Irma Castillo, Christopher Orellana, & Diana Portillo • The following students have demonstrated mastery of all Unit 2 standards on average: • Douglas Garcia, Gerardo Garcia, Christopher Orellana, Diana Portillo, and Andres Valencia

  5. Shout Outs! (Period 4) • The following students demonstrated mastery (3 or 4) of all the Unit 2 standards on their Unit 2 exam: • Karla Giron, Kiemon Gordon & Abel Martinez • The following students have demonstrated mastery of all Unit 2 standards on average: • Patrick Jones, Antonio Ojeda, Luis Orellana, and Briceida Pacheco

  6. Shout Outs! (Period 5) • The following students demonstrated mastery (3 or 4) of all the Unit 2 standards on their Unit 2 exam: • Luis Ayala, Jonathan Mendez, Alberto Payan, Surmani Sanford, Angel Tapia & XochiltVillafana • The following students have demonstrated mastery of all Unit 2 standards on average: • Angel Tapia

  7. Shout Outs! (Period 6) • The following students demonstrated mastery (3 or 4) of all the Unit 2 standards on their Unit 2 exam: • Melissa Alvarez, Kevin Chavez & Sabrina Montgomery • The following students have demonstrated mastery of all Unit 2 standards on average: • Melissa Alvarez, Kevin Chavez, Deya Garcia, Sabrina Montgomery, & Christine Romo

  8. Objectives • I can use my periodic table to calculate the molar mass of any element, compound, or molecule.

  9. Agenda • Catalyst & Shout Outs • Homework Review • Molar Mass Puzzle Activity • Exit Slip

  10. HW Review: Read pp. 230-233; problems: pp. 233 #11, pp. 240 #5 & 10(a, b, c, & e) • (233) 11. The mass of 6.022 x 1023 molecules of ibuprofen is 206.31 g. • (To solve, we must remember that 6.022 x 1023 molecules = 1 mole and that the mass of 1 mole of a molecule is whatever that molecule’s molar mass is. The question gave us the molar mass as 206.31 g/mol.)

  11. HW Review: Read pp. 230-233; problems: pp. 233 #11, pp. 240 #5 & 10(a, b, c, & e) • 5. What is the ratio of N and H atoms in NH3? • 1N:3H For every N atom there are 3 H atoms.

  12. HW Review: Read pp. 230-233; problems: pp. 233 #11, pp. 240 #5 & 10(a, b, c, & e) • 10(a). Molar mass of CsCl-- Answer: 168.35 g/mol • Steps to Solve: (1) Find the molar mass of the individual elements. Use the periodic table. The molar mass is the same as the average atomic mass. Just change the units from amu to g/mol. • Cs = 132.905 g/molCl= 35.453 g/mol • (2) Use the compound formula to determine how many of each element is in the compound. • CsClis a 1:1 ratio of Cs and Cl (there are no subscript numbers telling us differently) • (3) Add the molar masses in the correct ratio. • 1 mol Cs = 132.90 g • 1 molCl = 35.453 g • 132.90g + 35.453 g = 168.353 g/mol (rounded = 168.35 g/mol)

  13. More HW Review: 240 #10 • (b) Molar mass of KClO3? Answer: 122.55 g/mol • Steps to Solve: (1) Find the molar mass of the individual elements. Use the periodic table. The molar mass is the same as the average atomic mass. Just change the units from amu to g/mol. • K = 39.098 g/molCl= 35.453 g/mol O = 15.999 g/mol • (2) Use the compound formula to determine how many of each element is in the compound. • KClO3 1K: 1Cl: 3O • (3) Add the molar masses in the correct ratio. • 1 mol K = 39.098 g • 1 molCl = 35.453 g • 3 mol O = 15.999 g x 3 = 47.997 g • 39.098 g + 35.453 g + 47.997 g = 122.55 g/mol • (c) Molar mass of C6H12O6? Answer: 180.18 g/mol • (e) Molar mass of C2H5NO2? Answer: 75.08 g/mol

  14. Molar Mass Puzzle! • Instructions: • Work with a partner • You will receive a stack of puzzle pieces. • Half have an element or compound formula and the other half have the molar mass. • Match the formula with the molar mass. • Write the answers down. • When you think you have all the answers, raise your hand and Ms. Boon will check.

  15. Exit Slip • What is the molar mass of Potassium? • What is the molar mass Potassium Chloride (KCl)? • What is the molar mass of ozone (O3)? • The molar mass of NaCl is 58.44 g/mol. What is the mass of 2 moles of NaCl? • One mole of water contains 6.02 x 1023 molecules. How many water molecules are in 3 moles of water?

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