Moles and Molar Mass
Presentation
•
Chemistry
•
10th Grade
•
Medium
+1
Standards-aligned
Niki Safakas
Used 52+ times
FREE Resource
6 Slides • 15 Questions
1
Calculating Molar Mass of a Compound
Determine the number of atoms of each element
Multiply the number of atoms by the atomic mass of each element
Add the molar masses of each element together for the molar mass of the compound
2
Multiple Choice
Which BEST describes what the unit of mole can be used for?
To measure the amount of grams in a substance
To measure the amount of atoms or molecules in a substance
To measure the amount of energy in a substance
To measure the amount of bonding in a substance
3
Multiple Choice
How many Oxygen atoms are in the compound Ba3(PO4)2
4
8
6
3
4
Multiple Choice
grams
amu
grams/mole
liters
5
Multiple Choice
Atomic mass
Atomic number
Oxidation number
Valence electrons
6
Multiple Choice
What is the molar mass of phosphorus?
123.88 g
30.97 g
123.88 g/mol
30.97 g/mol
7
Reorder
Reorder the following in the order of steps on calculating molar mass
Count the # of atoms of each element
Use the periodic table to determine the mass of each element
Multiply the number of atoms of each element by their mass
add all of the different amounts
8
Multiple Choice
Calculate the molar mass of AuCl3
96 g
130 g
232.5 g
303.3 g
9
Multiple Choice
The mass of an atom
a large number used to count particles
based on the volume of a substance
10
Multiple Choice
Calculate the moles in 12.7g of CaF2
0.20 mol
1,000.76 mol
6.14 mol
0.16 mol
11
Multiple Choice
What is the molar mass of Sr(NO3)2?
211.64 g/mol
163.64 g/mol
149.63 g/mol
197.63 g/mol
12
Multiple Choice
1 mole of Li
1 mole of Au
1 mole of Si
None, all are equal
13
Mole Conversions
#2 Mass and Moles
14
Mass & Moles
●
1 mole = molar mass (g), calculate from PTE.
●
To convert from…
○
moles to mass, multiply by molar mass
○
mass to moles, divide by molar mass
15
Example: What is the mass of 0.82 moles of lithium
carbonate, Li2CO3?
Moles to Mass
Multiply moles by molar mass.
16
Example: How many moles are in 2.3 g sodium chloride,
NaCl?
Mass to Moles
Divide mass by molar mass.
17
Conversion tips
The unit you are looking for always goes on the top of the conversion factor
If both numbers are on the top multiply them
If one number is on the top and one is on the bottom divide.
18
Multiple Choice
111 grams
0.008 grams
98.9 grams
none of the choices
19
Multiple Choice
How many moles are in 100.0 g of dinitrogen oxide (N2O)?
2.272 mol N2O
6.25 mol N2O
7.14 mol N2O
44.013 mol N2O
20
Multiple Choice
How many grams are in 2.40 mol of sulfur?
9.35 x 10-3 g
77.0 g
616 g
0.0748 g
21
Multiple Choice
A mass of 6 g of Carbon contains
1 mole of C
2 moles of C
0.5 moles of C
Calculating Molar Mass of a Compound
Determine the number of atoms of each element
Multiply the number of atoms by the atomic mass of each element
Add the molar masses of each element together for the molar mass of the compound
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