Entry Task: Feb 4 th Monday WRITE THE QUESTION DOWN Entry Task Question: How many moles are there in...
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Transcript of Entry Task: Feb 4 th Monday WRITE THE QUESTION DOWN Entry Task Question: How many moles are there in...
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
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