Mountains into molehills
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Mountains into Molehills. Mass-Mole Conversions. Chem Catalyst. Arsenic, As, arsenic (III) oxide, As 2 O 3 , and arsenic (III) sulfide, As 2 S 3 , are all toxic because they contain arsenic. Which is more toxic, 1 mol of As or 1 mol of As 2 O 3 ? Explain your thinking.

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Mountains into Molehills

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Mountains into molehills

Mountains into Molehills

Mass-Mole Conversions


Chem catalyst

Chem Catalyst

  • Arsenic, As, arsenic (III) oxide, As2O3, and arsenic (III) sulfide, As2S3, are all toxic because they contain arsenic.

    • Which is more toxic, 1 mol of As or 1 mol of As2O3? Explain your thinking.

    • Which is more toxic, 1 g of As2O3 or 1 g of As2S3? Explain.


Activity

Activity

  • Tape the questions to your left-hand page

  • Answer the questions on the right-hand page.

  • Tape tables onto the right hand page in the appropriate place in the question sequence.


Homework

Homework

  • Toxins Lesson 11: Mountains into Molehills

  • Pages 392-394

  • Questions 3-8


Discussion

Discussion

  • Why is it important to be able to convert back and forth between mass and number of moles?

  • Using Dimensional Analysis to convert: =

    =

6.02 x 1023 items

1 mole

1 mole

6.02 x 1023 items

1 mole

X grams

X grams

1 mole


Practice using dimensional analysis

Practice Using Dimensional Analysis

  • How many moles of As in a sample with a mass of 125 g?

  • What is the mass in grams of 3.0 moles of Mg?

  • How many moles of CaCl2 are in a sample with a mass of 10g?

  • What is the mass of a 0.16 mole sample of Cl2?

  • How many molecules are in 0.0583 moles of H2O?

  • How many molecules are in a 35 gram sample of H2O?


Gas molar volume

Gas Molar Volume

  • Can you measure the mass of a gas easily?

  • What is the volume of one mole of a gas? Check your Lesson 10, What’s in a Mole, table.

  • Do you think this is always true for every gas?

  • Standard temperature = 273 degrees Kelvin (what is this in Celsius?)

  • Standard pressure = 1 atmophere (atm) (= 14.7 lb/in2)

  • STP = 273 deg K and 1 atm

  • All gasses occupy 22.4 Liters at STP


Gas conversions

Gas Conversions

22.4 Liters

1 mole

1 mole

22.4 Liters

  • What is the volume of 2.5 moles of oxygen gas (O2) at STP?

  • How many moles of CH4 gas is in 0.4 Liters at STP?

  • How many grams of N2 gas is in 6.8 Liters at STP?

=


The mole house

The Mole House

  • In the Mole House, in order to get to any other room, you must pass through the “Moles Room”.


Sample problems

Sample Problems

  • On whiteboard


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