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
Moles
The Mole
• This is a unit of measurement.
Moles
• 1 mole = 6.02x 1023 particles
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
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= 6.02x1023 atoms= 63.5g
1 mole of NaCl Formula units= 6.02x1023 fu 58.5g
1 mole of water molecular units= 6.02x1023 mc= 18g
Avagadro’s number
= 6.02x1023 particles
In a lab 0.36mol Al are needed. How many particles is that? What type of particle is this?
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
How many moles of Na2CO3 contain 7.9x1024 f. units?
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
Mole to mass problems
• What is the molar mass of these substances?
PbH2O Cu Al NaCl
If you had 3.5 moles of Pb what is the mass
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
If I had 125.1 g H2O how many moles is that?
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
In groups
You have 6.0 moles of oxygen gas, what is the mass?
You have 6.0 moles of Oxygen gas, what is the mass?
6.0moles O x 32.0g O 192 grams
1mol O
=200g
In groups
The mass of a sample of ammonia is 232grams. How many moles are in the sample?
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
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
If you have 3.5 mol of O2 gas what is the volume?
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
If a gas has a volume of 10.0L, how many moles is that?
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
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. _______ ______________________
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
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?)
Convert 0.50 moles of ammonia vapor to liters.
0.50 mol x 22.4 L
1mol =11.2L = 11L
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
Mole to Mole Ratio’s
Balance:
Mg + O2 MgO
N2H4 + N2O4 N2 + H2O
2 Mg + O2 2 MgO
2 N2H4 + N2O4 3 N2 + 4 H2O
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
2 Mg + O2 2 MgO
__2__Mg:__2__MgO
___2_Mg:__1__O2
__1__O2: __2__MgO
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
If 3.5 moles of Mg react __1.8___moles of O2 to produce _3.5___ mole of MgO
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.
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