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Investigation 2: Weighing Toxins Lesson 5: Whack a mole!

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Unit IV Investigation II-X © 2004 Key Curriculum Press. Admit Slip Take a seat and quiet down for the Pop Quiz.

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Unit IV Investigation II-X © 2004 Key Curriculum Press. Todays Objectives Students will be able to: Find the molar mass of an element or compound Convert a number of moles of a substance into its mass in grams Convert the mass of a substance into the number of moles. Find the number of atoms or molecules in a sample, given the mass.

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Agenda Pop Quiz Admit Slip Quiz Review Exit Slip Product: Pop Quiz, Quiz Review, Exit Slip Homework: Study for Quiz Extra Credit Homework

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Quiz Review Answers 1. b) 6.02 x 10 23 2. The mass of _one mole_ 3.a) Mg: 24.3 g/mol c) CaS: 72.1 g/mol b) CO 2 : 44 g/mol d) C 6 H 12 O 6 :180 g/mol 4.4 mol * 18 g/mol = 72 g 5. 2.3 mol * 25.8 g/mol = 68.5 g

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Classwork Review 6.152 g / 54.94 g/mol = 2.76 mol 7. 3.7 mol * 25 g/mol = 92.5 g 8. 170 g / 32 g/mol = 5.3 mol 9. 600 g / 98 g/mol = 6.1 mol 10. 2.5 mol * 342 g/mol = 855 g

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Classwork Review 11. 400 g / 44 g/mol = 9.1 mol 12. He = 4 g/mol 13.a) 2 B. 78 c) 72 d) 16 14. (PO 4 ) 2 is 8 Os * 2 mol = 16 moles of O atoms

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Classwork Review 15. 12 g Li 1.729 mol * 6.02 x 10 23 = 10.40 x 10 23 = 1.04 x 10 24 atoms C (how many atoms are in 1 mole) 1.729 moles / 6.94 g/mol =

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Classwork Review 16.1.3 x 10 25 molecules Hey, this kinda looks like the mole number. Lets see if we can change it into 10 23 1.3 x 10 25 = 13 x 10 24 = 130 x 10 23 Lets divide this by the mole number to see how many moles this is! 130 x 10 23 6.02 x 10 23 = 21.59 moles = 22 mol B

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Unit IV Investigation II-X © 2004 Key Curriculum Press. Exit Slip How many N 2 molecules are in a 140 g sample? 140 g N 2 5 mol * 6.02 x 10 23 = 30.1 x 10 23 = 3.01 x 10 24 molecules N 2 5 moles / 28 g/mol = (how many atoms are in 1 mole)

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Unit IV Investigation II-X © 2004 Key Curriculum Press. How are moles used to track chemical changes? Chemists use moles to track atoms and molecules that are going through chemical changes. Moles of atoms and molecules are conserved in a chemical equation. In order to calculate mass from moles: Multiply # of moles by the molar mass. In order to calculate moles from mass: Divide # of grams by the molar mass.

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