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!

Agenda: Discuss Mole Lab- Post Lab Mole Notes #3 particles to Moles to Grams H.W. Particles  Moles  Grams 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 Observable Grams, Liters, etc… MOLE BRIDGE Mass (grams) 1 mol = MW g

Order of Operations- The SET Up 1.Starting amount 2/3. Mole/particle conversion (1 mole = 6.02 x10 23 ) small thing 3/2. Gram/Mole conversion (1 mole = Molar mass (g))

Practice: Particles to Grams

The Set-up How many grams are in 2.74 x10 22 formula units of LiCl? 2.74 x f.u of LiCl 1 mole of LiCl 6.02 x f.u LiCl Place starting amount here 1 mole of LiCl g of LiCl Mole/Particle Conversion Mole/Gram conversion

The Clean up How many grams are in 2.74 x10 22 formula units of LiCl? 2.74 x f.u of LiCl 1 mole of LiCl 6.02 x f.u LiCl CROSS OUT LABELS ACROSS FROM EACH OTHER = 19.3 x grams of LiCl (2.74)(42.394)/6.02 = mole of LiCl g of LiCl Now the exponents: then – = = 1.93 grams of LiCl

Particles to grams conversions How many grams are in 1.26 x molecules of nitrogen gas? 1.26 x molecules of N 2 1 mole of N x molecules N 2 Place starting amount here = 5.86 grams of N 2 (1.26)( )/6.02 = 5.86 then – = 10 0 N2N2 N= g X 2 = g 1 mole = grams 1 mole of N g of N Mole/Particle Conversion Mole/Gram conversion

Particles to grams conversions How many grams are in a 4.39 x ions of Br -1 ? 4.39 x ions of Br 1 mole of Br 6.02 x ions Br Place starting amount here Place conversion here = 5.83 x 10 1 grams of Br (4.39)(79.904)/6.02 = 58.3 then – = 10 0 Br-1 Br -1 = g 1 mole of Br g of Br

Practice: Grams to particles

The Set-up How many formula units are there in 45.0 grams of LiCl? 45.0 g of LiCl 1 mole of LiCl 6.02 x f.u LiCl Place starting amount here 1 mole of LiCl g of LiCl Mole/Gram Conversion Mole/Particle conversion

The Clean up How many formula units are there in 45.0 grams of LiCl? 45.0 g of LiCl 1 mole of LiCl 6.02 x f.u LiCl 1 mole of LiCl g of LiCl CROSS OUT LABELS ACROSS FROM EACH OTHER (45.0)(6.02)/42.39 = 6.39 = 6.39 x formula units of LiCl

g of N 2 Particles to grams conversions How many molecules of nitrogen gas are there in 275 grams? 275 grams of N 2 1 mole of N x molecules N 2 Place starting amount here = 5.91 x molecules of N 2 (275)(6.02)/ = 59.1 x molecules of N 2 N2N2 N= g X 2 = g 1 mole = grams 1 mole of N Mole/gram Conversion Mole/Particle conversion