Moles Packet
Name: ___________________________ Pd. _____
Representative Particles
1. A baker uses a baker’s dozen to count. A chemist uses the __________ to count. A baker counts
donuts, but a chemist counts ______________________________________________________.
2. What is a mole? ________________________________________________________________.
3. Avogadro’s number is equal to ____________________________________________________.
4. Who determined how many particles were in a mole? __________________________________.
5. How many representative particles are in a mole? _____________________________________.
6. Particle: ______________________________________________________________________.
7.
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The amount of particles in a mole of the following:
An element? _______________________________
A covalent molecule? ________________________
An ionic compound? _________________________
Formula units? ______________________________
Use the following template for the questions that follow:
Given
Answer with units
Conversion
Factor
Put “1” here
8. Answer the following questions using the above template
a. How many atoms of potassium make up a mole?
Answer with units
b. How many ions of potassium make up 2 moles?
Answer with units
c. How many formula units of salt make up 10 moles?
Answer with units
d. How many molecules of water make up 5 moles?
Answer with units
e. How many atoms are in 5.2 moles of sodium?
Answer with units
f.
How many moles are in 12.04 x 10 23 atoms of carbon?
Answer with units
g. How many molecules are in 17.4 moles H2?
Answer with units
h. How many moles in are in 12.04 x 10 23 molecules of water?
Answer with units
i. How many moles are in 18.06 x 10 23 formula units of salt?
Answer with units
j.
How many formula units are 6 moles of NaCl?
Answer with units
Moles and Molar Mass
1. What is molar mass? ___________________________________________________________
2. What are the units for molar mass? ________________________________________________
3. How is molar mass calculated? ___________________________________________________
4. How is the molar mass of an element different from the molar mass of a compound/molecule?
_____________________________________________________________________________
5. Find the molar mass of the following:
a. C
d. H2O
g. (OH)3
b. C2O
e. Fe
h. HCl
c. NaCl
f. (PO4)2
i. MgCl2
6. Use the following template to help you with the questions that follow:
Given
Conversion
factor
Answer with units
Put “1” here
a.
How many moles are in 35.24 g NaCl?
Answer with units
b.
How many moles are in 187.32 grams of CH3Cl?
Answer with units
c.
What is the mass of 42.3 moles of Ca3N2?
Answer with units
d.
What is the mass of 0.256 moles of CO2?
Answer with units
e. Find the mass in grams of 3.32 mol of K.
Answer with units
f.
Find the mass in grams of 15.0 mol of H2SO4.
Answer with units
g.
Find the number of moles in 187 g of aluminum.
Answer with units
h.
Find the number of moles in 11.0 g of methane (CH4).
Answer with units
i.
Find the mass in grams of 0.423 moles of calcium fluoride.
Answer with units
j.
Find the number of moles in 182.15 grams of lead (II) nitrate.
Answer with units
5
Percent Composition
1)
CuBr2
Mass of total molecule/compound: ________
Cu: ___________%
Br: ___________%
2)
NaOH
Mass of total molecule/compound: ________
Na: ___________%
O: ___________%
H: ___________%
3)
(NH4)2S
Mass of total molecule/compound: ________
N: ___________%
H: ___________%
S: ___________%
4)
N2S2
Mass of total molecule/compound: ________
N: ___________%
S: ___________%
6
The Mole Warm-Ups
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15/16
17
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