moles
DESCRIPTION
Moles. The Mole. This is a unit of measurement. Moles. 1 mole = 6.02x 10 23 particles. Find amount of particles and weight. 1 mole of copper atoms= 1 mole of NaCl Formula units= 1 mole of water molecular units=. 1 mole of copper atoms= 6.02x10 23 atoms= 63.5g - PowerPoint PPT PresentationTRANSCRIPT
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Moles
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The Mole
• This is a unit of measurement.
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Moles
• 1 mole = 6.02x 1023 particles
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Substances Element Ionic Compound
Molecular Compound
Representative particle
Atom Formula Units
Molecules
Example Sodium Sodium
Chloride
Water
Mass Use: Atomic mass
Use:
Formula Unit
Use:
Molecular mass
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Find amount of particles and weight
1 mole of copper atoms=
1 mole of NaCl Formula units=
1 mole of water molecular units=
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1 mole of copper atoms= 6.02x1023 atoms= 63.5g
1 mole of NaCl Formula units= 6.02x1023 fu 58.5g
1 mole of water molecular units= 6.02x1023 mc= 18g
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Avagadro’s number
= 6.02x1023 particles
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In a lab 0.36mol Al are needed. How many particles is that? What type of particle is this?
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In a lab 0.36mol Al are needed. How many particles is that? What type of particle is this?
0.36mol X 6.02x1023 particles = 2.1672 x1023
1 mol Al
2.2 x1023 atoms
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How many moles of Na2CO3 contain 7.9x1024 f. units?
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How many moles of Na2CO3 contain 7.9x1024 f. units?
7.9x1024 f.units x 1 mole
6.02x1023 f.units
13.1229 13 moles
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Mole to mass problems
• What is the molar mass of these substances?
PbH2O Cu Al NaCl
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If you had 3.5 moles of Pb what is the mass
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If you had 3.5 moles of Pb what is the mass
3.5 mol Pb x 207.2g Pb 725.2g
1 mol Pb
730g
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If I had 125.1 g H2O how many moles is that?
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If I had 125.1 g H2O how many moles is that?
125.1g H2O x 1mol H2O 6.950mol
18.0g H2O
6.950mol
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In groups
You have 6.0 moles of oxygen gas, what is the mass?
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You have 6.0 moles of Oxygen gas, what is the mass?
6.0moles O x 32.0g O 192 grams
1mol O
=200g
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In groups
The mass of a sample of ammonia is 232grams. How many moles are in the sample?
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The mass of a sample of ammonia is 232grams. How many moles are in the sample?
232g NH3 x 1 mol 13.647mol
17.0 g
13.6 mol
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Volume
1 mole of any gas at STP has a volume of 22.4L
STP=Standard Temperature and Pressure
0o C and 1 atm
1 mol gas = 22.4L
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If you have 3.5 mol of O2 gas what is the volume?
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If you have 3.5 mol of O2 gas what is the volume?
3.5 mol O2 x 22.4 L O2
1 mol O2
78.4 L
78L
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If a gas has a volume of 10.0L, how many moles is that?
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If a gas has a volume of 10.0L, how many moles is that?
10.0 L x 1 mol
22.4 L
=0.4462 mol
0.446 mol
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What is the unit/ type of particle/ amount for Representative particles for each of the following:
Matter: Element Ionic cmpd Molecular cmpd
R. Part.Type: _______ __________ ____________
Unit: _______ ______________________
AmountOf Part. _______ ______________________
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What is the unit/ type of particle/ amount for Representative particles for each of the following:
Matter: Element Ionic cmpd Molecular cmpd
R. Part.
Type: atoms formula units molecules
Unit: atoms formula units molecules
Amount
Of Part. 6.02x1023 atoms 6.02x1023 formula units 6.02x1023 molecules
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SOLVE
Convert 0.50 moles of ammonia vapor to liters.
How many particles are in 0.35 mol of CaCl2
(what type of particles will we have?)
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Convert 0.50 moles of ammonia vapor to liters.
0.50 mol x 22.4 L
1mol =11.2L = 11L
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How many particles are in 0.35 mol of CaCl2
(what type of particles will we have?)
0.35 mol x 6.02x1023 f.units
1mol
=2.107x1023 f.units
= 2.1x1023 f.units
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Mole to Mole Ratio’s
Balance:
Mg + O2 MgO
N2H4 + N2O4 N2 + H2O
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2 Mg + O2 2 MgO
2 N2H4 + N2O4 3 N2 + 4 H2O
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Coefficients represent the number of moles for each element. This gives us a ratio in the rnx.
2 Mg + O2 2 MgO
____Mg:____MgO
____Mg:____O2
____O2: ____MgO
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2 Mg + O2 2 MgO
__2__Mg:__2__MgO
___2_Mg:__1__O2
__1__O2: __2__MgO
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2 Mg + O2 2 MgO
If 3.5 moles of Mg react __(#1)___moles of O2 to produce __(#2)__ mole of MgO
#1
3.5 mol Mg x 1 mol O2 =1.75 mol O2
2 mol Mg = 1.8 mol O2
#2
3.5 mol Mg x 2 mol MgO = 3.5 mol MgO
2 mol Mg
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If 3.5 moles of Mg react __1.8___moles of O2 to produce _3.5___ mole of MgO
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2 N2H4 + N2O4 3 N2 + 4 H2O
3.75 moles of N2O4 Find the other amount of moles needed.
If 3.75 mol N2O4 rnx with ____ mol N2H4 they will produce ___ mol N2 and ___ mol H2O.
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2 N2H4 + N2O4 3 N2 + 4 H2O
3.75 mol N2O4 x 2 mol N2H4
1 mol N2O4 =7.50 mol N2H4
3.75 mol N2O4 x 3 mol N2
1 mol N2O4 =11.25 mol N2
=11.3 mol N2
3.75 mol N2O4 x 4 mol H2O
1 mol N2O4 =15.0 mol H2O