entry task: block 1 feb 1 st - 2 nd block 2 entry task question: write the question down! how many...
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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?
Agenda:
• Sign off and discuss Mole Particle ws• Mole notes #2 MolesGrams• HW: MolesGrams ws
I can …• Calculate the number of moles in a given mass• Calculate the number of moles particles.• Calculate the molar mass of a compound.
Moles ParticlesHow many atoms are in 4.31 moles of carbon?
Stoichiometry- set up!
4.31 moles of C
1 mole of C
6.02 x 1023 atoms
Place starting amount here
Place conversion here
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Place the units you want to get rid of diagonal from each other
= 25.946 x 1023 atoms C
3 Sig Figs and Sci notation!!!
= 2.59 x 1024 atoms C
Moles ParticlesHow many moles are in a 5.55 x 1037 formula units of zinc II phosphate
Stoichiometry- set up!
5.55 x1037 fu Zn3(PO4)21 mole of Zn3(PO4)2
6.02 x 1023 fu Zn3(PO4)2
Place starting amount here
Place conversion here
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Place the units you want to get rid of diagonal from each other
= 0.922 x1014 moles
Subtract exponents
= 9.22 x1013 moles of Zn3(PO4)2
3 Sig Figs and Sci notation!!!
Moles ParticlesHow many moles are in a 9.25 x 1058 atoms of gold?
Stoichiometry- set up!
9.25 x1058 atom Au 1 mole of Au
6.02 x 1023 atoms
Place starting amount here
Place conversion here
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Place the units you want to get rid of diagonal from each other
= 1.54 x1035 moles Au
Subtract exponents
Moles ParticlesHow many atoms are in 989 moles of magnesium?
Stoichiometry- set up!
989 moles of Mg
1 mole of Mg
6.02 x 1023 atoms
Place starting amount here
Place conversion here
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Place the units you want to get rid of diagonal from each other
= 5950 x 1023 atoms Mg
3 Sig Figs and Sci notation!!!
= 5.95 x 1026 atoms Mg
Moles ParticlesHow many moles are in a 2.57 x 1048 molecules of phosphorus dioxide?
Stoichiometry- set up!
2.57 x1048 molecules PO2 1 mole PO2
6.02 x 1023 molecules PO2
Place starting amount here
Place conversion here
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Place the units you want to get rid of diagonal from each other
= 0.427 x1025 moles
Subtract exponents
= 4.27 x1024 moles
Moles ParticlesHow many atoms are in 0.130 moles of iron III oxide?
Stoichiometry- set up!
0.130 moles of Fe2O3
1 mole of Fe2O3
6.02 x 1023 atoms
Place starting amount here
Place conversion here
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Place the units you want to get rid of diagonal from each other
= 0.7826 x 1023 atoms Fe2O33 Sig Figs and
Sci notation!!!
= 7.83 x 1022 atoms Fe2O3
Moles ParticlesHow many formula units are in 2.85 moles of lithium chlorate? Stoichiometry- set up!
2.85 moles of LiClO3
1 mole of LiClO3
6.02 x 1023 f.u
Place starting amount here
Place conversion here
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Place the units you want to get rid of diagonal from each other
= 17.157 x 1023 fu of LiClO3
3 Sig Figs and Sci notation!!!
= 1.72 x 1024 f.u. of LiClO3
Moles ParticlesHow many moles are in a 5.50 x 1046 atoms of copper?
Stoichiometry- set up!
5.50 x1046 atoms Cu 1 mole of Cu
6.02 x 1023 atoms Cu
Place starting amount here
Place conversion here
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Place the units you want to get rid of diagonal from each other
= 0.914 x1023 moles
Subtract exponents
= 9.14 x1022 moles of Cu3 Sig Figs and Sci notation!!!
Moles ParticlesHow many moles are in a 2.50 x 1031 molecules of water?
Stoichiometry- set up!
2.50 x1031 molecules of water 1 mole of water
6.02 x 1023 molecules of water
Place starting amount here
Place conversion here
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Place the units you want to get rid of diagonal from each other
= 0.415 x108 moles
Subtract exponents
= 4.15 x107 moles of water3 Sig Figs and Sci notation!!!
Moles ParticlesHow many formula units are in 0.364 moles of barium nitrate? Stoichiometry- set up!
0.364 moles of Ba(NO3)2
1 mole of Ba(NO3)2
6.02 x 1023 f.u
Place starting amount here
Place conversion here
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Place the units you want to get rid of diagonal from each other
= 2.19 x 1023 fu of Ba(NO3)2
3 Sig Figs and Sci notation!!!
Moles to Mass ConversionsA 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 mole of that atom.
This would also be known as its molar mass.
Moles to Mass ConversionsPractice: 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?
What is the atomic mass of sodium? 22.9 grams
What is the mass of 1 mole of sodium?
12.01 grams
22.9 grams
Molar Mass
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
What is the molar mass of Water- H2O
Molar Mass
Lead II nitratePb +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
What is the molar mass of lead II nitrate?
So the molar mass of compound/molecule/atoms/ions is the
same as its mass in 1 mole OR
6.02 x1023 compounds/molecules/atoms/ions.
Moles GramsHow many grams would be in 2.0 moles of water?
Stoichiometry- set up!
2.0 moles of water
1 mole of water
18 grams
Place starting amount here
Place conversion 1mole = molar mass
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Place the units you want to get rid of diagonal from each other
= 36 grams of water
= 3.6 x101 grams of water
Moles GramsHow many grams would be in 0.65 moles of water?
Stoichiometry- set up!
0.65 moles of water
1 mole of water
18 grams
Place starting amount here
Place conversion 1mole = molar mass
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Place the units you want to get rid of diagonal from each other
= 11.7 grams of water
= 1.2 x101 grams of water
GramsMolesHow many moles would be in 0.65 grams of water?
Stoichiometry- set up!
0.65 grams of water 1 mole of water
18 grams
Place starting amount here
Place conversion 1mole = molar mass
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Place the units you want to get rid of diagonal from each other
= 0.036 moles of water
= 3.6 x10-2 moles of water
GramsMolesHow many moles would be in 75.0 grams of Lead II nitrate? Stoichiometry- set up!
75.0 grams of Pb(NO3)2 1 mole of Pb(NO3)2
331.208 grams
Place starting amount here
Place conversion 1mole = molar mass
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Place the units you want to get rid of diagonal from each other
= 0.226 moles of Pb(NO3)2
= 2.26 x10-1 moles of Pb(NO3)2
GramsMolesWhat if I have 0.680 moles of Ammonium phosphate, how
many grams would that be?
Place starting amount here
0.680 mole (NH4)3PO4
Place conversion here
1 mole (NH4)3PO4
--------------- 149 grams of (NH4)3PO4
--------------= 101 grams of
(NH4)3PO4
3 Sig Figs and Sci notation!!!
(NH4)3PO4N= 14.007 g X 3 = 42.021 g
H= 1.0079 g X 12 = 12.095 g
P= 30.974 g X 1 = 30.974 g
O= 15.999 g X 4 = 63.996 g
1 mole = 149.086 grams
= 1.01 X 102 grams of (NH4)3PO4
GramsMolesWhat if I have 3.5 moles of Strontium chlorate, how many
grams would that be?
Place starting amount here
3.5 mole Sr(ClO3)2
Place conversion here
1 mole Sr(ClO3)2
--------------- 255 grams of Sr(ClO3)2
--------------= 891 grams of
Sr(ClO3)2
2 Sig Figs and Sci notation!!!
Sr(ClO3)2
Sr= 87.62 g X 1 = 87.62 g
O= 15.999 g X 6 = 95.994 gCl= 35.453 g X 2 = 70.906 g
1 mole = 254.52 grams
= 8.9 x102grams of Sr(ClO3)2
