
Dimensional Analysis
Presentation
•
Chemistry, Mathematics, Science
•
10th Grade
•
Practice Problem
•
Medium
Standards-aligned
Kalena Mauga
Used 51+ times
FREE Resource
7 Slides • 15 Questions
1
Dimensional Analysis
Practice your knowledge of dimensional analysis.
2
Conversion factors that we use when...
Converting between moles and particles: 1 mol = 6.02×1023
Converting between moles and grams: 1 mol = molar mass (g)
NOTE: You can use BOTH conversion factors to convert between particles and grams
3
Multiple Choice
What conversion factor would you use to determine how many moles are in 5.8 grams of water (H2O)?
1 mol = 6.02 x 1023 particles
1 mol = molar mass (g)
6.02 x 1023 particles = molar mass (g)
None of the above
4
Multiple Choice
What conversion factor would you use to determine how many moles are in 78 atoms of Na?
1 mol = molar mass
1 mol = 1 mol
1 mol = 6.02 x 1023 particles
1 mol = 62 x 1023 particles
5
Converting particles to grams
particles --> moles --> grams
given ×given unitmol×molgrams
6
Converting grams to particles
grams --> moles --> particles
given (g)×gmoles×molesparticles
7
Multiple Choice
How will you determine the amount of grams in 4.5 atoms of Na?
Convert 4.5 atoms to grams (molar mass), then to moles (avogadro's number)
Convert 4.5 atoms to grams (molar mass), then to moles (avogadro's number)
Convert 4.5 atoms to moles (avogadro's number), then to grams (molar mass)
Convert 4.5 atoms to particles, then to grams
8
Multiple Choice
How would you determine the amount of particles in 9.2 grams of MgO2?
Convert 9.2 grams to moles only.
Convert 9.2 atoms to moles (avogadro's number), then to grams (molar mass)
Convert 9.2 grams to particles (avogadro's number), then to moles (molar mass)
Convert 9.2 grams to moles (molar mass), then to particles (avogadro's number)
9
Multiple Choice
Which of the following shows the correct set up to convert from moles to grams?
mol×molgrams
mol×gramsmol
grams×gramsmol
None of the above
10
Setting up dimensional analysis:
particles to moles:
given units×given unitsmolmoles to particles: moles×molesparticles
grams to moles: g×molar mass (g)moles
moles to grams: moles×molesmolar mass (g)
11
Multiple Choice
How will you determine the amount of grams in 4.5 atoms of Na?
Convert 4.5 atoms to grams (molar mass), then to moles (avogadro's number)
Convert 4.5 atoms to grams (molar mass), then to moles (avogadro's number)
Convert 4.5 atoms to moles (avogadro's number), then to grams (molar mass)
Convert 4.5 atoms to particles, then to grams
12
Multiple Choice
Determine how many molecules of water are in 4.5 g of water. What should be used to complete the dimensional analysis set up below?
Molar mass of water
Avogadro's Number (6.02 x 10^23)
Atomic mass of hydrogen
1 molecule
13
Multiple Choice
Calculate how many grams are in 3.4 moles of water by completing the dimensional analysis set up below:
18.02 moles
3.4 moles
3.4 grams
18.02 grams
14
Multiple Choice
Determine how many grams of water are in 34 molecules of water by finishing the dimensional analysis set up below:
moles
molecules
grams
atoms
15
Multiple Choice
When converting from particles to grams, how should the dimensional analysis be set up?
particles ×molparticles×molgram
particles ×particlesmol×gramsmol
particles ×particlesmol×molgram
grams ×particlesmol×molparticles
16
Calculating Molar Mass
Write each individual element
Determine the number of moles for each element in the compound
Multiply the number of moles of the element by its atomic mass to find the total mass for each element
Add each total mass together to get molar mass
17
Calculate molar mass of water (H2O)
H: 2 moles x 1.01 g/mol = 2.02 g H
O: 1 mol x 16 g/mol = 16 g O
2.02 g + 16 g = 18.02 g of H2O
Molar mass = 18.02 g
18
Multiple Choice
Calculate the molar mass of MgO2.
56.3 g
65.4 g
70 g
123 g
19
Multiple Choice
To find the molar mass of NaCl, what should you multiply the atomic mass of Na by?
4 mol
3 mol
2 mol
1 mol
20
Multiple Choice
Calculate the molar mass of CuCl2.
34.45 g
204.1 g
150.2 g
134.4 g
21
Multiple Choice
To find the molar mass of CaCO3, what should you do to find the total mass of oxygen (O).
1 mol x 16 g/mol
3 mol x 40 g/mol
3 mol x 16 g/mol
1 mol x 40 g/mol
22
Multiple Choice
Calculate the molar mass of K2SO4.
174.2 g
147.2 g
472.1 g
217.4 g
Dimensional Analysis
Practice your knowledge of dimensional analysis.
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