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Entry Task: Block 1 Feb 1 st - 2 nd Block 2

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Entry Task: Block 1 Feb 1st- 2nd Block 2

Entry Task Question:

WRITE THE QUESTION DOWN!

How many moles are in 2.57 x1048 molecules of phosphorus dioxide?

- Sign off and discuss Mole Particle ws
- Mole notes #2 MolesGrams
- HW: MolesGrams ws

- Calculate the number of moles in a given mass
- Calculate the number of moles particles.
- Calculate the molar mass of a compound.

Moles Particles

How many atoms are in 4.31 moles of carbon?

Stoichiometry- set up!

Place starting amount here

Place the units you want to get rid of diagonal from each other

4.31 moles of C

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

6.02 x 1023 atoms

= 25.946 x 1023 atoms C

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

1 mole of C

3 Sig Figs and Sci notation!!!

Place conversion here

= 2.59 x 1024 atoms C

Moles Particles

How many moles are in a 5.55 x 1037 formula units of zinc II phosphate

Stoichiometry- set up!

Place starting amount here

Place the units you want to get rid of diagonal from each other

1 mole of Zn3(PO4)2

5.55 x1037 fu Zn3(PO4)2

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

= 0.922 x1014 moles

Subtract exponents

6.02 x 1023 fu Zn3(PO4)2

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

Place conversion here

3 Sig Figs and Sci notation!!!

= 9.22 x1013 moles of Zn3(PO4)2

Moles Particles

How many moles are in a 9.25 x 1058 atoms of gold?

Stoichiometry- set up!

Place starting amount here

Place the units you want to get rid of diagonal from each other

9.25 x1058 atom Au

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

1 mole of Au

= 1.54 x1035 moles Au

6.02 x 1023 atoms

---------

Subtract exponents

Place conversion here

Moles Particles

How many atoms are in 989 moles of magnesium?

Stoichiometry- set up!

Place starting amount here

Place the units you want to get rid of diagonal from each other

989 moles of Mg

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

6.02 x 1023 atoms

= 5950 x 1023 atoms Mg

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

1 mole of Mg

3 Sig Figs and Sci notation!!!

Place conversion here

= 5.95 x 1026 atoms Mg

Moles Particles

How many moles are in a 2.57 x 1048 molecules of phosphorus dioxide?

Stoichiometry- set up!

Place starting amount here

Place the units you want to get rid of diagonal from each other

2.57 x1048 molecules PO2

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

1 mole PO2

= 0.427 x1025 moles

Subtract exponents

6.02 x 1023molecules PO2

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

Place conversion here

= 4.27 x1024 moles

Moles Particles

How many atoms are in 0.130 moles of iron III oxide?

Stoichiometry- set up!

Place starting amount here

Place the units you want to get rid of diagonal from each other

0.130 moles of Fe2O3

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

6.02 x 1023 atoms

= 0.7826 x 1023 atoms Fe2O3

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

1 mole of Fe2O3

3 Sig Figs and Sci notation!!!

Place conversion here

= 7.83 x 1022 atoms Fe2O3

Moles Particles

How many formula units are in 2.85 moles of lithium chlorate?

Stoichiometry- set up!

Place starting amount here

Place the units you want to get rid of diagonal from each other

2.85 moles of LiClO3

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

6.02 x 1023 f.u

= 17.157 x 1023 fu of LiClO3

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

1 mole of LiClO3

3 Sig Figs and Sci notation!!!

Place conversion here

= 1.72 x 1024 f.u. of LiClO3

Moles Particles

How many moles are in a 5.50 x 1046 atoms of copper?

Stoichiometry- set up!

Place starting amount here

Place the units you want to get rid of diagonal from each other

1 mole of Cu

5.50 x1046 atoms Cu

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

= 0.914 x1023 moles

Subtract exponents

6.02 x 1023 atoms Cu

---------

Place conversion here

3 Sig Figs and Sci notation!!!

= 9.14 x1022 moles of Cu

Moles Particles

How many moles are in a 2.50 x 1031 molecules of water?

Stoichiometry- set up!

Place starting amount here

Place the units you want to get rid of diagonal from each other

1 mole of water

2.50 x1031molecules of water

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

= 0.415 x108moles

Subtract exponents

6.02 x 1023molecules of water

---------

Place conversion here

3 Sig Figs and Sci notation!!!

= 4.15 x107moles of water

Moles Particles

How many formula units are in 0.364 moles of barium nitrate?

Stoichiometry- set up!

Place starting amount here

Place the units you want to get rid of diagonal from each other

0.364 moles of Ba(NO3)2

6.02 x 1023 f.u

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

= 2.19 x 1023 fu of Ba(NO3)2

1 mole of Ba(NO3)2

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

3 Sig Figs and Sci notation!!!

Place conversion here

Mole Notes #2

Moles to Mass Conversions

A dozen feathers and a dozen eggs would not have the same mass. Neither would a mole of Hydrogen and a mole of zinc.

To get masses, use the atomic mass from the periodic table

The atomic mass represents the mass of 1 moleof that atom.

This would also be known as its molar mass.

Moles to Mass Conversions

Practice: Use your atomic mass on the periodic table as its molar mass.

What is the atomic mass of carbon?

12.01 grams

What is the mass of 1 mole of carbon?

12.01 grams

What is the atomic mass of sodium?

22.9 grams

What is the mass of 1 mole of sodium?

22.9 grams

Molar Mass

What is the molar mass of Water- H2O

Hydrogen = 1.0079 X 2 = 2.0158 grams

Oxygen = 15.999 X 1 = 15.999 grams

H2O molar mass = 18.015 grams for 1 mole

Molar Mass

What is the molar mass of lead II nitrate?

Lead II nitrate

Pb+2

NO3-1

NO3-1

Pb(NO3)2

Pb= 207.2 g X 1 = 207.2 g

N= 14.007 g X 2 = 28.014 g

O= 15.999 g X 6 = 95.994 g

331.208 grams for 1 mole of Pb(NO3)2

How many grams would be in 2.0 moles of water?

Stoichiometry- set up!

Place starting amount here

Place the units you want to get rid of diagonal from each other

2.0 moles of water

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

18 grams

= 36 grams of water

1 mole of water

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

= 3.6 x101 grams of water

Place conversion 1mole = molar mass

How many grams would be in 0.65 moles of water?

Stoichiometry- set up!

Place starting amount here

Place the units you want to get rid of diagonal from each other

0.65 moles of water

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

18 grams

= 11.7 grams of water

1 mole of water

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

= 1.2 x101 grams of water

Place conversion 1mole = molar mass

How many moles would be in 0.65 grams of water?

Stoichiometry- set up!

Place starting amount here

Place the units you want to get rid of diagonal from each other

0.65 grams of water

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

1 mole of water

= 0.036 moles of water

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

18 grams

= 3.6 x10-2 moles of water

Place conversion 1mole = molar mass

How many moles would be in 75.0 grams of Lead II nitrate?

Stoichiometry- set up!

Place starting amount here

Place the units you want to get rid of diagonal from each other

75.0 gramsof Pb(NO3)2

1 mole of Pb(NO3)2

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

= 0.226 moles of Pb(NO3)2

331.208 grams

-----------

= 2.26 x10-1 moles of Pb(NO3)2

Place conversion 1mole = molar mass

(NH4)3PO4

What if I have 0.680 moles of Ammonium phosphate, how many grams would that be?

N= 14.007 g X 3 = 42.021 g

H= 1.0079 g X 12 = 12.095 g

Place starting amount here

P= 30.974 g X 1 = 30.974 g

O= 15.999 g X 4 = 63.996 g

1 mole = 149.086 grams

0.680 mole (NH4)3PO4

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

149 grams of (NH4)3PO4

= 101 grams of (NH4)3PO4

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

1 mole (NH4)3PO4

3 Sig Figs and Sci notation!!!

Place conversion here

= 1.01 X 102 grams of (NH4)3PO4

Sr(ClO3)2

What if I have 3.5 moles of Strontium chlorate, how many grams would that be?

Sr= 87.62 g X 1 = 87.62 g

Cl= 35.453 g X 2 = 70.906 g

Place starting amount here

O= 15.999 g X 6 = 95.994 g

1 mole = 254.52 grams

3.5 mole Sr(ClO3)2

255 grams of Sr(ClO3)2

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

= 891 grams of Sr(ClO3)2

1 mole Sr(ClO3)2

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

2 Sig Figs and Sci notation!!!

Place conversion here

= 8.9 x102grams of Sr(ClO3)2