Chemistry Week

24

Please get out your Notebook and

calculator!

Feb 26th, 2013

AGENDA:1 – Bell Ringer3 – Notes: Mole

Conversion: Mole to Gram and Mole to Particle

5 – Work Time

Today’s Goal:Students will be able to

convert from moles to grams and moles to particles.

Homework1. Mole Conversions

Wkst 1 – due tomorrow! (change to classwork assignment)

2. Work from Week 23 due by Friday

Tuesday, February 26

Objective: Students will be able to convert from

moles to grams and moles to particles.

Bell Ringer: One dozen cupcakes have a mass of

13.5 grams. What is the mass of 2.5 dozen cupcakes?

2 MINUTES REMAINING…

Tuesday, February 26

Objective: Students will be able to convert from

moles to grams and moles to particles.

Bell Ringer: One dozen cupcakes have a mass of

13.5 grams. What is the mass of 2.5 dozen cupcakes?

1 MINUTES REMAINING…

Tuesday, February 26

Objective: Students will be able to convert from

moles to grams and moles to particles.

Bell Ringer: One dozen cupcakes have a mass of

13.5 grams. What is the mass of 2.5 dozen cupcakes?

30 seconds Remaining…

Tuesday, February 26

Objective: Students will be able to convert from

moles to grams and moles to particles.

Bell Ringer: One dozen cupcakes have a mass of

13.5 grams. What is the mass of 2.5 dozen cupcakes?

10 seconds Remaining…

BELL-RINGER TIME IS

UP!

Feb 26th, 2013

AGENDA:1 – Bell Ringer3 – Notes: Mole

Conversion: Mole to Gram and Mole to Particle

5 – Work Time

Today’s Goal:Students will be able to

convert from moles to grams and moles to particles.

Homework1. Mole Conversions

Wkst 1 – due tomorrow! (change to classwork assignment)

2. Work from Week 23 due by Friday

Tuesday, February 26

Objective: Students will be able to convert from

moles to grams and moles to particles.

Bell Ringer: One dozen cupcakes have a mass of

13.5 grams. What is the mass of 2.5 dozen cupcakes?

2.5 dozen x 13.5 grams =

1 dozen

2.5 x 13.5 g

= 33.75 g

Mole Conversion

Obj: SWBAT convert between moles, grams and particles – Part 1

Date: 2/26/2013 Remember:

1 mole (mol) always = 6.02 x 1023 particles

1 mole = molar mass of ANY substance SO…. 6.02 x 1023 particles = molar mass

of ANY substance

Mole Conversion Ratios

The information for 1 mole can be used to create MOLAR RATIOS 1mole or molar mass of

substanceMolar mass 1 mole 1 mole or 6.02 x 1023

particles/atoms/molecules6.02 x 1023 1 mole

Mole to Gram Conversion

Imagine if you want to measure out a 1.5 mole sample of silver metal…? Could you count out 1.5 moles? But you can use molar mass to convert

moles to grams, and you can measure grams.

Molar Mass of Silver =

1.5 mole

107.9 g Ag

1 mole Ag

... NO!

x 107.9 g = 1 mole

1.5 x 107.9 g =

161.8 g Ag

Practice Problems

If you had a 7.5 mole sample of H2O, how many grams would you have?1. Determine the molar mass.2. Convert! (Watch units!)

1. H2O =2xH =O =

18.0 g 1 mol

(2 x 1.0)+ 16.0

2. 7.5 mole H2O x 18.0 g

1 mol= 7.5 x 18.0 g H2O

= 135.0 g H2O

Mole to Particle Conversion

Imagine if you want to know HOW MANY atoms are in 1.5 moles of silver metal…? Could you count out those particles? But you can use 6.02 x 1023 to convert

moles to atoms. NOTE: you DO NOT need molar mass when

converting to particles/atoms/molecules

1.5 mole

... NO!

X 6.02 x 1023 1 mole

= 9.03 x 1023 atoms

Practice Problems

If you had a 7.5 mole sample of H2O, how many particles would you have?

7.5 mole H2O x 6.02 x 1023 particles 1 mol

= 7.5 x 6.02 x 1023 particles of H2O

= 4.52 x 1024 particles of H2O

Problem Solving Decision Tree

Read the problem

If moles and grams

Calculate Molar Mass

If moles grams

Multiply by molar mass

Multiply by 6.02 x 1023

If moles and particles

If moles particles