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QOTD 11/12/13. Do the Chem Catalyst question on page 121. YOU WILL NEED A CALCULATOR AND A PERIDOIC TABLE! Get a periodic table from up front if you don’t have one already! Also have your homework from Friday ready (p. 117-120). QOTD Answer.

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Qotd 11 12 13

QOTD 11/12/13

Do the Chem Catalyst question on page 121.

YOU WILL NEED A CALCULATOR AND A PERIDOIC TABLE! Get a periodic table from up front if you don’t have one already!

Also have your homework from Friday ready (p. 117-120)


Qotd answer
QOTD Answer

  • There are 9 moles of C for every 1 mole of C9H8O4

  • Molar mass of C = 12.01 g / 1 mol

  • 9 mol C x 12.01 g = 108.09 g

    1 mol C


Answer key and today s assignment
Answer Key and Today’s Assignment

  • Check your homework answers using the answer key. Please ask me any questions you have during work time today or tutorial.

  • You now have work time on pages 121-122. We will go over the answers in 25 minutes.

  • If you finish early, please work on the homework on page 123 (#1-5 only)


Answers to pages 121 122
Answers to pages 121-122

  • STATION 1. I assumed I had 4.5 g of water but your number might be different.

  • Water = 2x H + 1 x O

  • 2 x 1.008 g/mol + 1 x 15.999 g/mol

  • Molar mass of water = 18.015 g/mol

  • 4.5 g x 1 mol H2O = 0.25 mol H2O

    18.015 g


Station 1
Station 1

  • So 0.25 moles H2O = ? molecules

    1 mole = avogadro’s number = 6.02 x 1023mcls

    mcls is shorthand for “molecules”

    0.25 mol x 6.02 x 1023mcls = 1.5 x 1023mcls

    1 mol


Station 2
Station 2

  • Piece of Al foil = _________ g

  • Molar mass of Al = 26.982 g/mol

  • ______ g Al x 1 mol Al = _______ mol Al

    26.982 g Al

    For silicon, molar mass = 28.085 g/mol

    Mass of piece of Si = _____g

    ______ g Si x 1 mol Si = _______mol Si

    28.085 g Si


Station 3
Station 3

  • NaOH = 1 x Na + 1 x O + 1 x H

  • 1 x 22.99 g/mol + 1 x 15.999 g/mol + 1 x 1.008 g/mol

    Molar mass of NaOH = 39.988 g/mol

    0.175 molNaOH x 39.988 g = 7.00 g

    1 molNaOH


Station 31
Station 3

  • Molar mass of NaCl = 58.443 g/mol

  • 0.30 molNaCl x 58.443 g = 17.5 g = 18 g

    1 molNaCl


Station 4
Station 4

  • Molar mass of Fe = 55.845 g/mol

    0.116 mol Fe x 55.845 g = 6.478 g = 6.50 g

    1 mol Fe


Homework
Homework

  • Finish page 123 # 1 – 5 only


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