Entry Task: Feb 4 th Monday WRITE THE QUESTION DOWN Entry Task Question: How many moles are there in 2000 grams of water (2 liters)? You have 5 minutes!

Entry Task: Feb 4th MondayWRITE THE QUESTION DOWN

Entry Task Question:How many moles are there in 2000 grams of

water (2 liters)?

You have 5 minutes!

Agenda:

• Discuss Mole Lab- Post Lab• Mole Notes #3 particles to Moles to Grams• H.W. ParticlesMolesGrams ws

I can…

• Calculate the molar mass of a compound.• Calculate particles moles grams

MOLE NOTES#3

THE MOLE IS A BRIDGE BETWEEN THE MICROSCOPIC WORLD OF

ATOMS AND THE MACROSCOPIC WORLD OF MATERIALS AND

OBJECTS.

When converting from super tiny (particles, ions, molecules, compounds) we use mole as a bridge to the large (grams, liters, etc)

Particles MOLE

Grams

Microscopic World of Particles

Atoms, Ions, Molecules, & Formula Units

Macroscopic World of the ObservableGrams, Liters, etc…

MOLE BRIDG

E

Mass (grams)

1 mol = MW g

Order of Operations-The SET Up

1. Starting amount2/3. Mole/particle conversion (1 mole = 6.02 x1023) small thing3/2. Gram/Mole conversion (1 mole = Molar mass (g))

Practice: Particles to Grams

The Set-upHow many grams are in 2.74 x1022 formula units of LiCl?

2.74 x 1022 f.u of LiCl 1 mole of LiCl

6.02 x 1023 f.u LiCl

Place starting amount here

1 mole of LiCl

42.39 g of LiCl

Mole/Particle Conversion

Place units across each

other!

Mole/Gram conversion

Place units across each

other!

- Its 42.39 g

Hey- I need the molar

mass!

The Clean upHow many grams are in 2.74 x1022 formula units of LiCl?

2.74 x 1022 f.u of LiCl 1 mole of LiCl

6.02 x 1023 f.u LiCl

CROSS OUT LABELS ACROSS FROM EACH OTHER

------------

----------

= 19.3 x 10-1 grams of LiCl

(2.74)(42.394)/6.02 = 19.3

1 mole of LiCl

42.39 g of LiCl------------

------------

Now the exponents: then 1022 – 1023 = 10-1

= 1.93 grams of LiCl

Particles to grams conversionsHow many grams are in 1.26 x 1023 molecules of nitrogen gas?

1.26 x 1023 molecules of N2 1 mole of N2

6.02 x 1023 molecules N2

Place starting amount here

----------

----------

= 5.86 grams of N2

(1.26)(28.0134)/6.02 = 5.86 then 1023 – 1023 = 100

N2N= 14.0067 g X 2 = 28.0134 g

1 mole = 28.0134 grams

1 mole of N2

28.0134 g of N2------------

------------

Mole/Particle Conversion

Mole/Gram conversion

Particles to grams conversionsHow many grams are in a 4.39 x 1023 ions of Br-1?

4.39 x 1023 ions of Br 1 mole of Br

6.02 x 1023 ions Br

Place starting amount here

Place conversion here

----------

----------

= 5.83 x 101 grams of Br

(4.39)(79.904)/6.02 = 58.3 then 1023 – 1023 = 100

Br-1 Br-1= 79.904 g

1 mole of Br

79.904 g of Br------------

------------

Practice: Grams to particles

The Set-upHow many formula units are there in 45.0 grams of LiCl?

45.0 g of LiCl 1 mole of LiCl 6.02 x 1023 f.u LiCl

Place starting amount here

1 mole of LiCl42.39 g of LiCl

Mole/GramConversion

Place units across each

other!

Mole/Particle conversion

Place units across each

other!

- Its 42.39 g

Hey- I need the molar

mass!

The Clean upHow many formula units are there in 45.0 grams of LiCl?

45.0 g of LiCl 1 mole of LiCl 6.02 x 1023 f.u LiCl

1 mole of LiCl42.39 g of LiCl

CROSS OUT LABELS ACROSS FROM EACH OTHER

------------

(45.0)(6.02)/42.39 = 6.39

= 6.39 x 1023 formula units of LiCl

------------

------------

------------

28.0134 g of N2

Particles to grams conversionsHow many molecules of nitrogen gas are there in 275 grams?

275 grams of N2 1 mole of N2 6.02 x 1023 molecules N2

Place starting amount here

----------

----------

= 5.91 x 1024 molecules of N2

(275)(6.02)/28.0134 = 59.1 x 1023 molecules of N2

N2N= 14.0067 g X 2 = 28.0134 g

1 mole = 28.0134 grams

1 mole of N2

------------

------------

Mole/gram Conversion

Mole/Particle conversion